5.19 Identify the force present and explain whether work is being performed in the following cases: (a) You lift a pencil off the top of a desk. (b) A spring is compressed to half its normal length.

Answer:

12,608 kPa

Explanation:

First we need to convert the density to standard units, that is kg/m^3

0.85 g/cm^3 = 0.85 × [tex]\frac{100^{3} }{1000}[/tex] = 0.85 × 1000 = 850 kg/m^3

Pressure of oil = pressure at surface + rho × g × h

= 101,000 + (850×9.81×1500)

= 12,608 kPa

The units in the part 'rho.g.h' will cancel out against each other and you will be left with the unit Pascals - which is the unit for pressure.

Hope that answers the question, have a great day!

Answer:

A spectrometer

Explanation:

In empty space, the quantity that is always larger for X-ray radiation than for a radio wave is the frequency.

Frequency is the number of complete cycles (oscillations) of a wave that occur in one second. It is measured in Hertz (Hz), where 1 Hz means one cycle per second. X-ray radiation has a higher frequency than radio waves.

On the electromagnetic spectrum, X-rays have much higher frequencies compared to radio waves. X-rays have frequencies in the range of [tex]10^16[/tex] to [tex]10^19[/tex] Hz, while radio waves typically have frequencies in the range of [tex]10^3[/tex] to [tex]10^9[/tex] Hz. Therefore, X-ray radiation has significantly higher frequencies than radio waves.

Wavelength and amplitude are other properties of waves, but they are not always larger for X-ray radiation than for a radio wave. The wavelength of X-rays is much shorter than that of radio waves, and the amplitude can vary depending on the specific wave source and conditions.

Hence, In empty space, the quantity that is always larger for X-ray radiation than for a radio wave is the frequency.

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Answer:

It takes approximately 0.009 seconds for the capacitor to discharge to half its original charge.

Explanation:

Recall that the capacitor discharges with an exponential decay associated with the time constant for the circuit ([tex]\tau_0=RC[/tex]) which in our case is;

[tex]\tau_0=1.3\,k\Omega\,*\,10.0 \mu F=13\,\,10^{-3}\,s[/tex] (13 milliseconds)

Recall as well the expression for the charge in the capacitor (from it initial value [tex]Q_0[/tex], as it discharges via a resistor R:

[tex]Q(t)=Q_0\,e^{-\frac{t}{RC} }[/tex]

So knowing that the capacitor started with a charge of 30 [tex]\mu C[/tex] and reduced after a time "t" to 30 [tex]\mu C[/tex] , and knowing from our first formula what the RC of the circuit is, we can solve for the time elapsed using the charge as function of time equation shown above:

[tex]Q(t)=Q_0\,e^{-\frac{t}{RC} }\\15 \mu C=30 \mu C\,\,e^{-\frac{t}{13\,ms} }\\e^{-\frac{t}{13\,ms} }=\frac{1}{2} \\-\frac{t}{13\,ms}=ln(\frac{1}{2})\\t=-13\,ms\,*\,ln(\frac{1}{2})\\t=9.109\,\, ms[/tex]

In seconds this is approximately 0.009 seconds

Final answer:

The question involves calculating the time it takes for the charge on a capacitor to reduce to a certain value in an RC circuit, using the natural logarithm and the RC time constant formula. This is a Physics problem relevant to High School level.

Explanation:

The subject matter of the student's question is Physics, specifically relating to the discharge of a capacitor through a resistor and the calculation of time constants in RC circuits. The grade level would be High School, as it involves concepts typically taught in a high school physics course.

How to Calculate the Discharge Time

To calculate the time it takes for a capacitor to reduce its charge to a certain value, we use the formula V = V0 * e^(-t/RC), where V0 is the initial voltage, V is the final voltage, R is the resistance, C is the capacitance, t is the time, and e is the base of the natural logarithm. However, since we're dealing with the capacitor's charge rather than voltage, we can adapt the formula to Q = Q0 * e^(-t/RC). By substituting the given values and solving for t, we can find the time it takes for the capacitor's charge to decrease from 30.0 μC to 15.0 μC.

To solve for t, we would take the natural logarithm of both sides after dividing by Q0, resulting in t = -RC * ln(Q/Q0). Inserting the given values (R = 1.30 kΩ and C = 10.0 μF), and calculating the natural logarithm of (Q/Q0 = 15.0 μC / 30.0 μC), we find the time required for the charge to drop to half its initial value.

Answer:

a) 2.90*10^-6 T

b) 0.092A

Explanation:

a) The magnitude of the magnetic field is given by the formula for the calculation of B when it makes an electron moves in a circular motion:

[tex]B=\frac{m_ev}{qR}[/tex]

me: mass of the electron = 9.1*10^{-31}kg

q: charge of the electron = 1.6*10^{-19}C

R: radius of the circular path = 4.3cm=0.043m

v: speed of the electron = 2.20*10^4 m/s

By replacing all these values you obtain:

[tex]B=\frac{(9.1*10^{-31}kg)(2.20*10^4 m/s)}{(1.6*10^{-19}C)(0.043m)}=2.90*10^{-6}T=2.9\mu T[/tex]

b) The current in the solenoid is given by:

[tex]I=\frac{B}{\mu_0 N}=\frac{2.90*10^{-6}T}{(4\pi*10^{-7}T/A)(25)}=0.092A=92mA[/tex]

To find the strength of the magnetic field inside the solenoid, we can use the formula for the magnetic field produced by a solenoid. To find the current in the solenoid, we can use the formula for the magnetic force experienced by a charged particle moving in a magnetic field.

To find the strength of the magnetic field inside the solenoid, we can use the formula for the magnetic field produced by a solenoid: B = µ0nI, where B is the magnetic field, µ0 is the permeability of free space (4π × 10-7 T·m/A), n is the number of turns per unit length, and I is the current flowing through the solenoid.

Given that the solenoid has 25 turns per centimeter and the radius of the circular path is 4.3 cm, we can find the number of turns per unit length: n = 25 × 100 cm = 2500 turns/m.

The strength of the magnetic field inside the solenoid is then: B = (4π × 10-7 T·m/A) × (2500 turns/m) × (I).

To find the current in the solenoid, we can use the formula for the magnetic force experienced by a charged particle moving in a magnetic field: F = qvB, where F is the magnetic force, q is the charge of the particle, v is its velocity, and B is the magnetic field.

Given that the velocity of the electron is 2.20 × 104 m/s and the radius of the circular path is 4.3 cm, we can find the magnetic force experienced by the electron: F = (1.6 × 10-19 C) × (2.20 × 104 m/s) × (B).

Since the magnetic force is centripetal, it can also be expressed as F = mv2/r, where m is the mass of the electron, v is its velocity, and r is the radius of the circular path.

Combining these two equations, we can find the current in the solenoid: I = (mv2/r) / (vB).

The magnitude of the angular velocity immediately after the collision is

[tex]\( 14.4 \, \text{rad/s} \)[/tex].

To find the angular velocity immediately after the collision, we can apply the principle of conservation of angular momentum. The angular momentum before the collision equals the angular momentum after the collision.

The angular momentum before the collision is zero since the rod is at rest. After the collision, the bullet-rod system rotates together. We can calculate the moment of inertia [tex]\( I \)[/tex] of the system and then use the equation [tex]\( L = I\omega \)[/tex], where [tex]\( L \)[/tex] is the angular momentum and [tex]\( \omega \)[/tex] is the angular velocity.

First, calculate the moment of inertia of the system:

[tex]\[ I = \frac{1}{3}mL^2 + md^2 \][/tex]

[tex]\[ I = \frac{1}{3}(3)(0.25)^2 + (0.0045)(0.25/4)^2 \][/tex]

[tex]\[ I = 0.015625 \, \text{kg m}^2 \][/tex]

Now, apply conservation of angular momentum:

[tex]\[ I\omega = mvd \][/tex]

[tex]\[ \omega = \frac{mvd}{I} \][/tex]

[tex]\[ \omega = \frac{(0.0045)(300)(0.25/4)}{0.015625} \][/tex]

[tex]\[ \omega = 14.4 \, \text{rad/s} \][/tex]

So, the magnitude of the angular velocity immediately after the collision is [tex]\( 14.4 \, \text{rad/s} \)[/tex].

The question is incomplete! Complete question along with answer and step by step explanation is provided below.

Question:

A parallel-plate, air-filled capacitor is being charged as in Fig. 29.23. The circular plates have radius 4.10 cm, and at a particular instant the conduction current in the wires is 0.276 A. (a) What is the displacement current density jD in the air space between the plates? (b) What is the rate at which the electric field between the plates is changing? (c) What is the induced magnetic field between the plates at a distance of 2 cm from the axis? (d) What is the induced magnetic field between the plates at a distance of 1 cm from the axis?

Given Information:

Radius of parallel-plate capacitor = 4.10 cm = 0.041 m

Conduction current = Ic = 0.276 A

Required Information:

a) Displacement current density = JD = ?

b) Rate of change of electric field = dE/dt = ?

c) Magnetic field between plates at r = 2 cm = ?

d) Magnetic field between plates at r = 1 cm = ?

Answer:

a) Displacement current density = JD = 52.27 A/m²

b) Rate of change of electric field = dE/dt = 5.904×10¹² V/m.s

c) Magnetic field between plates at r = 2 cm = 6.568×10⁻⁷ Tesla

d) Magnetic field between plates at r = 1 cm = 3.284×10⁻⁷ Tesla

Explanation:

a) What is the displacement current density JD in the air space between the plates?

Displacement current density is given by

JD = Id/A

Where Id is the conduction current and A is the area of capacitor given by

A = πr²

A = π(0.041)²

A = 0.00528 m²

As you can notice in the diagram, conduction current has equal displacement between the capacitor plates therefore, Id = Ic

JD = 0.276/0.00528

JD = 52.27 A/m²

b) What is the rate at which the electric field between the plates is changing?

The rate of change of electric field is given by

dE/dt = JD/ε₀

Where JD is the displacement current density and ε₀ is the permittivity of free space and its value is 8.854×10⁻¹² C²/N.m²

dE/dt = 52.27/8.854×10⁻¹²

dE/dt = 5.904×10¹² V/m.s

c) What is the induced magnetic field between the plates at a distance of 2 cm from the axis?

The induced magnetic field between the plates can be found using Ampere's law

B = (μ₀/2)*JD*r

Where μ₀ is the permeability of free space and its value is 4π×10⁻⁷ T.m/A, JD is the displacement current density and r is the distance from the axis.

B = (4π×10⁻⁷/2)*52.27*0.02

B = 6.568×10⁻⁷ Tesla

d) What is the induced magnetic field between the plates at a distance of 1 cm from the axis?

B = (μ₀/2)*JD*r

B = (4π×10⁻⁷/2)*52.27*0.01

B = 3.284×10⁻⁷ Tesla

This physics-based question involves understanding the properties and behaviors of a parallel-plate, air-filled capacitor. Specifically, it focuses on finding the displacement current density and the rate at which the electric field between the plates is changing as the capacitor is charged.

The question revolves around a parallel-plate capacitor, a system of two identical conducting plates separated by a distance. This specific case involves an air-filled capacitor where the plates have a certain radius, and a conduction current is defined.

First, let's address part (a): What is the displacement current density jD in the air space between the plates? The displacement current density, noted as 'jD', can be found by using Maxwell's equation which correlates the time rate of change of electric flux through a surface to the displacement current passing through the same surface.

For (b): What is the rate at which the electric field between the plates is changing? As the current is introducing charge onto the plates, the electric field (which is proportional to the charge on the capacitor's plates) will be changing. This change can be calculated as the derivative of the electric field's magnitude with respect to time.

Without specific numerical values or more information, I'm unable to provide a more detailed analysis or a concrete answer.

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Answer:

Spectrophotometry is the quantitative measurement of light spectra reflection and transmission properties of materials as function of the wavelength. Photometry measures the total brightness as seen by the human eye

Explanation:

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Answer:

v = 2 m/s

Explanation:

The object moves 20 m in 10 s initially. Then it remains at rest for 20 s. It is required to find the average speed of the object.

Fro 10 s it covers 20 m. For that time, speed is :

[tex]v=\dfrac{d}{t}\\\\v=\dfrac{20\ m}{10\ s}\\\\v=2\ m/s[/tex]

For 20 s, it was at rest means distance covered is 0. So, speed is 0.

The average speed of the object is equal to the sum of speed for 10 s and for 20 s i.e.

v = 2 m/s + 0 = 2 m/s

So, the average speed of the object is 2 m/s.

The third point charge must be located at the point where the net electric force on it is zero.

The net electric force on a point charge is the vector sum of the electric forces exerted on it by all the other point charges. The electric force exerted by a point charge q1 on a point charge q2 is given by Coulomb's law:

F = k * |q1| * |q2| / r^2

where k is Coulomb's constant, |q1| and |q2| are the magnitudes of the charges, and r is the distance between the charges.

The direction of force will be opposite for both charges, and since net force is zero, the force due to both charges will be equal and opposite.

So, |q1| * (1/r1^2) = |q2| * (1/r2^2)

Where r1 is the distance between point charge 1 and point charge 3, r2 is the distance between point charge 2 and point charge 3.

Solving for position of point charge 3, we can say that it is located at y = 0.

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To find the position where a third charge experiences zero net force due to two other charges along the y-axis, we must consider the magnitudes and signs of all charges and use Coulomb's Law. The third charge will be or negative and situated closer to the smaller magnitude charge to balance the forces. The exact position, however, cannot be determined without the magnitude of the third charge.

The question pertains to the concept of electric forces and charge equilibrium in Physics. We are asked to find the position where a third charge would experience a net electric force of zero due to the presence of two other point charges arranged along the y-axis. The charges are q1 = − 9.0 μC at y = 6.0 m and q2 = − 8.0 μC at y = − 4.0 m.

Let's denote the position of the third charge as y3 where the net force is zero. To ensure a net force of zero on the third charge, the electric force due to q1 must be equal in magnitude and opposite in direction to the force due to q2. Since both q1 and q2 are negative, the third charge must also be negative (so it will be repelled by both). The third charge must be placed between q1 and q2.

Likewise, since q1 is larger in magnitude than q2, the third charge must be placed closer to q2 to balance the forces (since electric force is inversely related to the square of the distance). Mathematically, we can set up the equation where the magnitude of the forces due to each charge on the third charge is equal. This investigation involves Coulomb's Law (F = k · |q1 · q3| / r^2), where F is the force between charges, k is Coulomb's constant, q3 is the third charge, and r is the distance between the charges involved.

Through setting up the equations and solving for y3, we can determine the precise location. Unfortunately, the problem does not provide the magnitude of the third charge, so while we can describe the process, we can't compute a specific answer without this information. In a real scenario though, any negative third charge would suffice, and its magnitude would not affect the balance point.

Answer:

Mass of the sphere is 19.2 kg

Explanation:

We have given diameter of the sphere d = 0.74 m

So radius r = 0.37 m

Initial angular velocity [tex]\omega _i=0rad/sec[/tex]

Time t = 14 sec

Angular displacement [tex]\Theta =160revolution=160\times 2\pi =1004.8rad[/tex]

From second equation of motion

[tex]\Theta =\omega _it+\frac{1}{2}\alpha t^2[/tex]

So [tex]1004.8=0\times t+\frac{1}{2}\times \alpha \times 14^2[/tex]

[tex]\alpha =10.25rad/sec^2[/tex]

Torque is given [tex]\tau =10.8Nm[/tex]

Torque is equal to [tex]\tau =I\alpha[/tex], here I is moment of inertia and [tex]\alpha[/tex] angular acceleration

So [tex]10.8=10.25\times I[/tex]

[tex]I=1.053kgm^2[/tex]

Moment of inertia of sphere is equal to [tex]I=\frac{2}{5}Mr^2[/tex]

So [tex]1.053=\frac{2}{5}\times M\times 0.37^2[/tex]

M = 19.23 kg

So mass of the sphere is 19.23 kg

Using conservation of momentum, the lighter piece in the explosion scenario lands 53 meters away from the launch point in the opposite direction in which the heavier piece landed.

The question revolves around a scenario where conservation of momentum applies. An object of mass
3M explodes into two pieces of mass M and 2M. The conservation of momentum dictates that the center of mass of the two pieces and the original object all follow the same horizontal trajectory. If the heavier piece lands 53 meters away from the point of launch, then, due to the center of mass being conserved during the explosion, the lighter piece would have landed at the same point of launch.

Utilizing the conservation law, which states that the total momentum before the explosion must be equal to the total momentum after the explosion, the pieces must move symmetrically about the center of mass of the original object. Given that the larger piece is observed to land 53 meters away from the launch point and has twice the mass of the smaller piece, the smaller piece would have landed 53 meters on the other side of the launch point, making a total separation of 106 meters between the two pieces. Therefore, the lighter piece would have landed 53 meters away in the opposite direction from where the heavier piece landed.

Answer:

n = 1.27

Explanation:

just took test :)

Answer:

N= 1.27

Explanation:

Answer:

52 rad

Explanation:

Using

Ф = ω't +1/2αt²................... Equation 1

Where Ф = angular displacement of the object, t = time, ω' = initial angular velocity, α = angular acceleration.

Since the object states from rest, ω' = 0 rad/s.

Therefore,

Ф = 1/2αt²................ Equation 2

make α the subject of the equation

α = 2Ф/t².................. Equation 3

Given: Ф = 13 rad, t = 2.5 s

Substitute into equation 3

α = 2(13)/2.5²

α = 26/2.5

α = 4.16 rad/s².

using equation 2,

Ф = 1/2αt²

Given: t = 5 s, α = 4.16 rad/s²

Substitute into equation 2

Ф = 1/2(4.16)(5²)

Ф = 52 rad.

Answer:

[tex]\theta = 52 rads[/tex]

Explanation:

The rotational kinetic equation is given by the formula:

[tex]\theta = w_{0} t + 0.5 \alpha t^{2}[/tex]..............(1)

The object is starting from rest, angular speed, w = 0 rad/s

At t = 2.5 sec, angular displacement, θ = 13 rad

Inserting these parameters into equation (1)

[tex]13 = (0 * 2.5) + 0.5 \alpha 2.5^{2}\\\alpha = \frac{13}{3.125} \\\alpha = 4.16 rad/s^{2}[/tex]

At time, t = 5.0 sec, we substitute the value of [tex]\alpha[/tex] into the kinematic equation in (1)

[tex]\theta = (0*5) + 0.5 *4.16* 5^{2}\\\theta = 52 rad[/tex]

Answer:

Explanation:

To detrmine the time interval at which the balls are in contact.

Given information

The mass of each steal ball 67.8g. The speed of ball towards each other is 4.80 m/s. The exerted force by each jaw 15.9 kN and the forece reduce the diameter by 0.130 mm.

Expression for the effective spring constant ball is shown below.

K = |F|/|x|

Here,

k is a spring constant

F is the force exerted on the ball

x is dispalcement due force

substitute 15.9 kN for F and 0.130 mm in above equation

The spring constant is 122 x 10⁶ N/m

Answer:

Explanation:

Given that,

His friend design has a turnable disk of radius 1.5m

R = 1.5m

The mass is twice the fully loaded elevator.

Let the mass of the full loaded elevator be M

Then, mass of the turn able

Mt = ½M

Radius of the disk that serves as a vertical pulley is ¼ radius of turntable and 1/16 of the mass.

Mass of pulley is

Mp = 1 / 16 × Mt

Mp = 1 / 16 × M / 2

Mp = M / 32

Also, radius of pulley

Rp = ¼ × R = ¼ × 1.5

Rp = 0.375m

The moment of inertia of the disk of a ring is

I = ½MR²

To calculate the moment of the turntable, we can use the formula

I_t = ½Mt•R²

I_t = ½ × ½M × 1.5²

I_t = 0.5625 M

I_t = 9M / 16

Also, the moment of inertia of the vertical pulley

I_p = ½Mp•Rp

I_p = ½ × (M/16) × 0.375

I_p = 0.01171875 M

I_p = 3M / 256

Let assume that, the tension in the cable between the pulley and the elevator is T1 and Let T2 be the tension between the turntable and the pulley

So, applying newton second law of motion,

For the elevator

Fnet = ma

Mg - T1 = Ma

a = (Mg-T1) / M

For vertical pulley,

The torque is given as

τ_p = I_p × α_p = (T2—T1)•r

τ_p = 3M/256 × α_p = (T2-T1)•r

For turntable

The torque is given as

τ_t = I_t × α_t = T2•r

τ_t = 9M/16 × α_t = T2•r

So, the torque are equal

τ_t = τ_p

9M/16 × α_t = 3M/256 × α_p

M cancel out

9•α_t / 16 = 3•α_p / 256

Cross multiply

9•α_t × 256 = 3•α_p × 16

Divide both sides by 48

48•α_t = α_p

α_t = α_p / 48

Then, from,

τ_t = 9M/16 × α_t = T2•r

T2•r = 9M / 16 × α_p / 48

T2•r = 3Mα_p / 16

Also, from

τ_p = 3M/256 × α_p = (T2-T1)•r

3M/256 × α_p = T2•r - T1•r

T1•r = T2•r - 3M/256 × α_p

T1•r = 3Mα_p / 16 - 3M/256 × α_p

T1•r = 3Mα_p / 16 - 3Mα_p/256

T1•r = 45Mα_p / 256

T1 = 45Mα_p / 256R

Then, from

a = (Mg-T1) / M

a = Mg - (45Mα_p / 256R) / M

a = g - 45α_p / 256

From the final answer, it is show that the acceleration is always less than acceleration due to gravity due to the subtraction of 45α_p / 256 from g

Answer:

a) Due to the characteristic that a converging lens focuses light rays from infinity and parallel to its main axis. Therefore, the lens should be placed at a distance "f" from the film, in this way it will form the image of the object placed at infinity in said film.

b) Since the converging lens produces an image of an object placed at a distance of 2f, the lens must be placed at the same distance (2f), so that this object that is placed at a distance of 2f is focused.

Explanation:

To focus an infinitely distant object, the lens should be placed at its focal length from the film or CCD. For an object at 2f, the lens should also be at a distance of 2f to focus the image correctly.

The question pertains to the principles of optics, specifically focusing using converging lenses in cameras.

(a) To focus an object that is infinitely far away, the lens should be placed at its focal length f from the film or CCD. This is because light rays from a distant object enter the lens parallel to its principal axis and converge at the focal point on the opposite side. Therefore, for an object at infinity, the image distance (di) approaches the lens's focal length (f).

(b) To focus an object at a distance of 2f in front of the lens, the lens should also be 2f from the film. This is derived from the lens formula (1/f = 1/do + 1/di) where do is the object distance and di is the image distance. For an object at 2f, solving the equation gives di = 2f.

The question is not clear enough. So i have attached a copy of the correct question.

Answer:

A) B = V/c

B) c = Lv

Explanation:

A) we know that formula for magnetic flux is;

Φ = BA

Where B is magnetic field and A is area

Now,

Let's differentiate with B being a constant;

dΦ/dt = B•dA/dt

From faradays law, the EMF induced is given as;

E = -dΦ/dt

However, we want to express it in terms of V and E.M.F is also known as potential difference or Voltage.

Thus, V = -dΦ/dt

Thus, we can now say that;

-V = B•dA/dt

Now from the question, we are told that dA/dt = - c

Thus;

-V = B•-c

So, V = Bc

Thus, B = V/c

B) according to Faraday's Law or Lorentz Force Law, an electromotive force, emf, will be induced between the two ends of the sidelength:

Thus;

E =LvB or can be written as; V = LvB

Where;

V is EMF

L is length of bar

v is velocity

From the first solution, we saw that;

V = Bc

Thus, equating both of the equations, we have;

Bc = LvB

B will cancel out to give;

c = Lv

The magnitude of the magnetic field B is calculated using Faraday's Law and is equal to V/-c. For a square loop being pulled out from the field, the rate of change of area is proportional to the speed of withdrawal and the length of the side still in the field. Hence, c = Lv.

Part A: The magnitude of the magnetic field B can be calculated using Faraday's Law of electromagnetic induction, which states that the induced voltage in a circuit is equal to the negative rate of change of magnetic flux. Mathematically, it is expressed as V = -dB/dt, where V is the induced emf, and dB/dt is the rate of change of magnetic field. Because the area is decreasing at a constant rate, the magnetic field B is V/-c.

Part B: The rate of change of the area, denoted as c = -da/dt, for a square loop of side length L being pulled out of the magnetic field with constant speed v, could be calculated using the formula c = Lv. This is because as the square loop is pulled out with a constant velocity, the rate at which its area decreases is proportional to its speed and the length of the side that is still in the field.

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Answer:

Forces observed by both is same as both

The frames are non-acceleration

Explanation:

Zweistein  =  Einstein

[tex](F_B + E_B)_Z[/tex] = [tex](F_B + E_B)_E[/tex]

                    as [tex](F_B + E_B)_E[/tex] tend to zero (0)

[tex](E_B)_Z[/tex] < [tex](F_B)_Z[/tex] as some quantity is subtracted from the force.

According to Einstein's Theory of Relativity, the laws of physics are the same for all observers, regardless of their motion. Applying this to the calculation of electric field strength around a sphere, both Einstein and Zweistein, assuming they are not accelerating, should compute the same value of the electric field.

If we consider the principles of physics consistently at play regardless of the observer, both Einstein and Zweistein must compute the same total force on the sphere. This is following Einstein's postulate stating the laws of physics remain the same in all inertial frames. Therefore, the electric field computed at the sphere by both Einstein and Zweistein should also be the same.

The principle of relativity implies that the laws of physics—including those of electric field strength—are the same for all observers, regardless of their speed or direction as long as they are not accelerating. Einstein's Theory of Relativity extends this to include accelerated motion and gravity.

This principle, combined with the equivalence of inertial and gravitational mass, is enough to show that the force of gravity perceived by an observer in an accelerating spacecraft must be the same as if the observer were stationary on the Earth. So, if Einsteins's Theory of Relativity applies to electric fields in the same way it does for gravitational fields, then the electric field strength calculated by Einstein and Zweistein should be the same.

To clarify, in the context of this question, the 'electric field' refers to the region around a charged particle or object where another charge placed within it would experience a force either of attraction or repulsion.

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Answer:

The intensity is  [tex]I = 0.0003053 \mu W/cm^2[/tex]

Explanation:

 From the question we are told

     The  frequency of the electromagnetic wave is  [tex]f = 86.0 Hz[/tex]

     The peak value of the electric field is  [tex]E_o = 2.30 mV/m = \frac{2.30}{1000 } = 2.30 *10^{-3} V/m[/tex]

Generally  the intensity of this wave is mathematically represented as

                [tex]I = c * \frac{1}{2} * \epsilon_o E^2_o[/tex]

Where c is the speed of light with value  [tex]c = 3 *10^8 m/s[/tex]

           [tex]\epsilon_o[/tex] is the permittivity of free space with value  [tex]\epsilon _o = 8.85 *10^{-12} C^2 /Nm^2[/tex]

Substituting values into equation for intensity

               [tex]I = 3.0 *10^8 * 0.5 * 8.85 *10^{-12} * 2.30*10^{-3}[/tex]

                 [tex]I = 3.053 *10^{-6} W/m^2[/tex]

Converting to [tex]cm^2[/tex] we divide by 10,000

                [tex]I = \frac{3.053 *10^{-6}}{10000} W/cm^2[/tex]

                [tex]= 3.053 *10^{-10} W/cm^2[/tex]

                [tex]= 0.0003053 *10^{-6} W/cm^2[/tex]

                [tex]I = 0.0003053 \mu W/cm^2[/tex]

Answer:

What displacement must the physics professor give the car

= 12.91 METERS

Explanation:

Check the attached file for explanation

Final answer:

To find the displacement that the physics professor must give the car, we can break down the different stages of the car's motion and use the equations of motion. By adding the displacements from each stage, we can find the total displacement of the car.

Explanation:

To find the displacement that the physics professor must give the car in order for its average velocity to be +6.50 m/s for the entire trip, we can break down the different stages of the car's motion and use the equations of motion.

1. From time t=0 to t=3.60s: The car is accelerated in the +x direction at 5.35 m/s². We can use the equation v = u + at to find the final velocity v1 at t=3.60s, where u is the initial velocity, a is the acceleration, and t is the time.

2. From time t=3.60s to t=8.10s: The car slows down at a rate of 1.95 m/s² due to friction. We can use the equation v = u + at to find the initial velocity u2 at t=3.60s, where v is the final velocity, a is the acceleration, and t is the time.

3. From time t=8.10s to t=12.60s: The physics professor pushes the car with a constant velocity for 4.50s. The average velocity during this time is +6.50 m/s. We can calculate the displacement during this time using the equation d = vt, where v is the velocity and t is the time.

By adding the displacements from each stage, we can find the total displacement of the car, which is the answer to the question.

Answer:

The tangential speed of the ball is 11.213 m/s

Explanation:

The radius is equal:

[tex]r=2.3*sin70=2.161m[/tex] (ball rotates in a circle)

If the system is in equilibrium, the tension is:

[tex]Tcos70=mg\\Tsin70=\frac{mv^{2} }{r}[/tex]

Replacing:

[tex]\frac{mg}{cos70} sin70=\frac{mv^{2} }{r} \\Clearing-v:\\v=\sqrt{rgtan70}[/tex]

Replacing:

[tex]v=\sqrt{2.161x^{2}*9.8*tan70 } =11.213m/s[/tex]

Answer:

The magnetic field exerts net force and net torque on the loop.

Answer:

flash

Explanation:

Answer:

Sonic obviously

Explanation:

Sonic's body was made to run, the flashes is just a normal human body.

Answer:2940

Explanation:

Answer:

0.635 kg

Explanation:

Recall that Kinetic energy is defined as:

K.E. = (1/2) mv²,

where

K.E = Kinetic energy = given as 140J

m = mass (we are asked to find this)

v = velocity = given as 21 m/s

Substituting the above values into the equation:

K.E. = (1/2) mv²

140 = (1/2) m (21)²   (rearranging)

m = (140)(2) / (21)²

m = 0.635 kg

Answer:

[tex]0.293I_0[/tex]

Explanation:

When the unpolarized light passes through the first polarizer, only the component of the light parallel to the axis of the polarizer passes through.

Therefore, after the first polarizer, the intensity of light passing through it is halved, so the intensity after the first polarizer is:

[tex]I_1=\frac{I_0}{2}[/tex]

Then, the light passes through the second polarizer. In this case, the intensity of the light passing through the 2nd polarizer is given by Malus' law:

[tex]I_2=I_1 cos^2 \theta[/tex]

where

[tex]\theta[/tex] is the angle between the axes of the two polarizer

Here we have

[tex]\theta=40^{\circ}[/tex]

So the intensity after the 2nd polarizer is

[tex]I_2=I_1 (cos 40^{\circ})^2=0.587I_1[/tex]

And substituting the expression for I1, we find:

[tex]I_2=0.587 (\frac{I_0}{2})=0.293I_0[/tex]

Answer:

Explanation:

Given that,

The light starts at a point 8cm beneath the surface

It strikes the surface 7cm directly above the light

The angle of incidence from the given distances is

Using trigonometry

Tan I = opp / adj

tan I= (7.0 cm)/(8.0 cm) = 0.875

I = arctan(0.875)

I = 41.1859

According to Snell's law

n(water) sin I = n(air) sin R

Here R =90° for total reflection to occur

nair = 1

n(water) sin I = n(air) sinR

n(water) = (1)sin 90

n(water) = 1

n(water) = 1/sin I

n(water) =1/ sin(41.1859o)

= 1.52

The refractive index index of the liquid is 1.52

To find the index of refraction of the liquid, we calculate the angle of incidence using the given distances and apply Snell's law. While specific numeric calculations aren't provided, the assumption is the liquid's refractive index is greater than air, as total internal reflection occurs.

A beam of light undergoes total internal reflection when it moves from a medium of higher refractive index to one of lower refractive index, and the angle of incidence is greater than the critical angle. In this case, we are given that a beam of light in a liquid undergoes total internal reflection. To determine the index of refraction of the liquid, we can use the information given about the distances involved to find the angle of incidence and then apply Snell's law.

First, we use the distances given to find the angle of incidence. The light source is 8.0 cm beneath the surface and strikes the surface 7.0 cm from the point directly above it. This forms a right triangle, allowing us to calculate the angle of incidence using trigonometry. The tangent of the angle of incidence (θ) is opposite over adjacent, or θ = tan⁻¹(8.0/7.0). The angle of incidence calculated is therefore tan⁻¹(8/7).

For total internal reflection to occur, the angle of incidence must be greater than the critical angle, which is defined by Snell's law as sin⁻¹(n₂/n₁) where n₂<n₁. Since we know the reflection happens at the interface with air (where n₂ = 1.00 for air), we can find the refractive index of the liquid. However, without exact values for angles given in this scenario, the specific calculation steps cannot be completed, but we understand that the liquid's refractive index is greater than 1, which is typical for most transparent materials compared to air.

Answer:

86.48 dB . Ans

Explanation:

Sound level by one singer = 70.8 dB

= 7.08 B

If I be its intensity in terms of watt/m²

log ( I / 10⁻¹² ) = 7.08 ( given )

I / 10⁻¹²  = 10⁷°⁰⁸

I = 10⁻¹² x 10⁷°⁰⁸

= 10⁻⁴°⁹²

= .000012022 W / m²

intensity by 37 singers

= 37 x .000012022 W /m²

= .0004448378

= 4448.378 x 10⁻⁷

intensity level

= log I / 10⁻¹² B

= log 4448.378 x 10⁻⁷ / 10⁻¹²

= log 444837800 B

log 4448378 + 2 B

= 6.6482 +2 B

8.6482 B

intensity level = 8.6482 B

= 86.48 dB . Ans

Answer:

86.48 dB

Explanation:

86.48 dB

Explanation:

sound level intensity, β = 70.8 dB  

Io = 10^-12 W/m²

Let the intensity if I at the level of 70.8 dB  

Use the formula  

7.08 = log I + 12

log I = - 4.92  

I = 1.2 x 10^-5 W/m²

There are 37 singers, so the total intensity is I'.  

I' = 37 x I  

I' = 37 x 1.2 x 10^-5 = 4.45 x 10^-4 W/m²

Let the sound intensity is β' in decibels.  

Use the formula  

β' = 86.48 dB

Answer:

I don't understand?

Explanation:

Could you please elaborate?

Answer:

Gravity

Explanation:

I know because im a verified expert

Answer:

gravity

Explanation:

1. gravity is the force that pulls us to the surface of the Earth, keeps the planets in orbit around the Sun and causes the formation of planets, stars and galaxies.

2. electromagnetism is the force responsible for the way matter generates and responds to electricity and magnetism.