A series LRC circuit consists of a 12.0-mH inductor, a 15.0-µF capacitor, a resistor, and a 110-V (rms) ac voltage source. If the impedance of this circuit is 45.0 Ω at resonance, what is its impedance at a frequency twice the resonance frequency?

Answer:

Final velocity, v = 1.74 m/s

Explanation:

Given that,

Mass of car 1, m₁ = 22509 kg

Velocity of car 1, v₁ = 4.21 m/s

Mass of car 2, m₂ = 31647 kg

It is stationary, v₂ = 0

Let v be the velocity of the two cars after they collide and attach. It can be calculated using law of conservation of momentum as :

[tex]m_1v_1+m_2v_2=(m_1+m_2)v[/tex]

[tex]v=\dfrac{m_1v_1+m_2v_2}{(m_1+m_2)}[/tex]

[tex]v=\dfrac{22509\ kg\times 4.21\ m/s+0}{22509\ kg+31647\ kg}[/tex]

v = 1.74 m/s

So, the velocity of two cars after the collision is 1.74 m/s. Hence, this is the required solution.

Answer:

[tex]F_2 = 1.10 \mu N[/tex]

Explanation:

As we know that the electrostatic force is a based upon inverse square law

so we have

[tex]F = \frac{kq_1q_2}{r^2}[/tex]

now since it depends inverse on the square of the distance so we can say

[tex]\frac{F_1}{F_2} = \frac{r_2^2}{r_1^2}[/tex]

now we know that

[tex]r_2 = 18.2 mm[/tex]

[tex]r_1 = 12.2 mm[/tex]

also we know that

[tex]F_1 = 2.45 \mu N[/tex]

now from above equation we have

[tex]F_2 = \frac{r_1^2}{r_2^2} F_1[/tex]

[tex]F_2 = \frac{12.2^2}{18.2^2}(2.45\mu N)[/tex]

[tex]F_2 = 1.10 \mu N[/tex]

Answer:

[tex]F_{applied} = 45.8 N[/tex]

Explanation:

When maximum force is applied on the crate along the plane so that it will not move then in that case friction force and component of the weight of the crate is along the plane opposite to the applied force

So here we will have

[tex]mgsin\theta + F_f = F_{applied}[/tex]

now we know that

[tex]F_f = \mu F_n[/tex]

also we know that

[tex]F_n = mg cos\theta[/tex]

so we will have

[tex]F_f = \mu ( mg cos\theta)[/tex]

now we will have

[tex]mg sin\theta + \mu (mg cos\theta) = F_{applied}[/tex]

[tex](5)(9.81)sin30 + (0.5)(5)(9.81)cos30 = F_{applied}[/tex]

so we will have

[tex]F_{applied} = 45.8 N[/tex]

The maximum force that can be applied parallel to the plane without moving the 5.0-kg crate on a 30° incline, considering a static friction coefficient of 0.5, is 45.7N.

To determine the maximum force that can be applied without moving the crate, we need to consider the effect of static friction, gravity, and the angle of the incline. The weight of the crate (W) is its mass (m) times acceleration due to gravity (g), which equals 5kg*9.8m/s² = 49N. However, this is the weight vertically down, so the force from gravity parallel to the incline is less, and we should multiply W by sin30⁰, getting 24.5N. The normal force (N) on the incline is W*cos30⁰, equal to 42.4N. Therefore, the maximum static friction force (fs) is coef. of static friction (μs) times N, which equals 0.5*42.4N = 21.2N. The max force applied to keep the crate from moving is the sum of the force of gravity and the static friction forces on the incline, which equals 24.5N + 21.2N = 45.7N.

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Answer:

Answer to the question is: 1837.65 millimeters of mercury are equal to 245 kPa.

Explanation:

1 kPa are equal to 7.50062 millimeters of mercury.

Final answer:

To convert the pressure from 245 kPa to mmHg, first convert kPa to atm, then multiply by the conversion factor from atm to mmHg. The pressure is 1837.68 mmHg.

Explanation:

To convert the pressure in a container from kilopascals (kPa) to millimeters of mercury (mmHg), we use the conversion factor that 1 atmosphere (atm) is equivalent to 760 mmHg. First, we convert the given pressure in kilopascals to atmospheres:

1 atm = 101.325 kPa

So, to convert 245 kPa to atm, we divide 245 kPa by 101.325 kPa/atm:

245 kPa / 101.325 kPa/atm = 2.418 atm

Next, we convert atmospheres to millimeters of mercury (mmHg) using the conversion factor:

2.418 atm x760 mmHg/atm = 1837.68 mmHg

Therefore, the pressure in the container is 1837.68 mmHg.

Answer:

[tex]C = 2.48 \times 10^{-4} Farad[/tex]

Explanation:

As per the equation of voltage on capacitor we know that

[tex]V = V_{max}(1 - e^{-\frac{t}{\tau}})[/tex]

now we know that voltage reached to its 80% of maximum value in 4 second time

so we will have

[tex]0.80 V_{max} = V_{max}(1 - e^{-\frac{4}{\tau}})[/tex]

[tex]0.20 = e^{-\frac{4}{\tau}}[/tex]

[tex]-\frac{4}{\tau} = ln(0.20)[/tex]

[tex]-\frac{4}{\tau} = -1.61[/tex]

[tex]\tau = 2.48[/tex]

as we know that

[tex]\tau = RC[/tex]

[tex](10 k ohm)(C) = 2.48[/tex]

[tex]C = 2.48 \times 10^{-4} Farad[/tex]

The closest expression for [tex]\( F_2 \)[/tex] in terms of [tex]\( F_1 \)[/tex] is.

[tex]\[ \\F_2 = \frac{3}{4} F_1} \][/tex]

This means that after transferring 2 bricks from one bag to the other, the gravitational attraction [tex]\( F_2 \)[/tex] between the bags is [tex]\( \frac{3}{4} \)[/tex] of the initial attraction [tex]\( F_1 \).[/tex]

When initially each bag contains 4 bricks of mass [tex]\( M \)[/tex] each, the total mass in each bag is [tex]\( 4M \)[/tex]. The bags exert a gravitational attraction [tex]\( F_1 \)[/tex] on each other.

Let's denote:

-[tex]\( F_1 \):[/tex] Initial gravitational attraction between the bags when each bag has 4 bricks.

- [tex]\( F_2 \):[/tex] Gravitational attraction after transferring 2 bricks from one bag to the other.

Initial Situation Before Transfer

Each bag has 4 bricks so the mass of each bag is [tex]\( 4M \).[/tex]

Gravitational Attraction [tex]\( F_1 \)[/tex]

[tex]\[ F_1 = G \frac{(4M)(4M)}{d^2} \][/tex]

where [tex]\( G \)[/tex] is the gravitational constant and [tex]\( d \)[/tex] is the distance between the centers of the bags.

After Transferring 2 Bricks:

Now, one bag has 6 brick mass 6m and the other bag has 2 bricks mass2m

Gravitational Attraction[tex]\( F_2 \)[/tex]

[tex]\[ F_2 = G \frac{(6M)(2M)}{d^2} \]s[/tex]

Simplifying [tex]\( F_2 \)[/tex]

[tex]\[ F_2 = G \frac{12M^2}{d^2} \][/tex]

Relation between [tex]\( F_2 \)[/tex] and [tex]\( F_1 \)[/tex]

To find the relation between [tex]\( F_2 \)[/tex] and [tex]\( F_1 \)[/tex] we compare them

[tex]\[ \frac{F_2}{F_1} = \frac{G \frac{12M^2}{d^2}}{G \frac{16M^2}{d^2}} \][/tex]

[tex]\[ \frac{F_2}{F_1} = \frac{12M^2}{16M^2} \][/tex]

[tex]\[ \frac{F_2}{F_1} = \frac{3}{4} \][/tex]

Explanation:

It is given that,

Mass of the shot, m = 7.27 kg

Time taken to accelerate, t = 1.3 s

It is shot from rest to 16 m/s and it raises to a height of 0.9 m. We need to find the power output of the shot-putter. It is given by :

[tex]P=\dfrac{energy}{time}[/tex]

Energy = kinetic energy + potential energy

[tex]E=\dfrac{1}{2}\times 7.27\ kg\times (16\ m/s)^2+7.27\ kg\times 9.8\ m/s^2\times 0.9\ m[/tex]

E = 994.68 J

Power, [tex]P=\dfrac{994.68\ J}{1.3\ s}[/tex]

P = 765.13 Watts

We know that, 1 horse power = 745.7 watts

Or P = 1.02 horse power

Hence, this is the required solution.

Answer:

Total pressure exerted at bottom =  119785.71 N/m^2

Explanation:

given data:

volume of water in bottle = 150 L = 0.35 m^3

Area of bottle = 2 ft^2

density of water = 1000 kg/m

Absolute pressure on bottom of bottle will be sum of atmospheric pressure and pressure due to water

Pressure due to water P = F/A

F, force exerted by water = mg

m, mass of water = density * volume

                             =  1000*0.350 = 350 kg

F  = 350*9.8 = 3430 N

A = 2 ft^2 = 0.1858 m^2  

so, pressure P = 3430/ 0.1858 = 18460.71 N/m^2

Atmospheric pressure

At sea level atmospheric pressure is 101325 Pa

Total pressure exerted at bottom  = 18460.71 + 101325 = 119785.71 N/m^2

Total pressure exerted at bottom =  119785.71 N/m^2

Answer:

option (B)

Explanation:

q = 3 c, m = 4 x 10^-3 kg, g  9.8 m/s^2,

In the equilibrium condition, the weight of the charge particle is balanced by the electrostatic force.

q E = mg

Electrostatic force = m g = 4 x 10^-3 x 9.8 = 0.0392 N

Answer:

542.06 K

Explanation:

v = rms speed of oxygen molecule = 650 m/s

M = molecular mass of the oxygen molecule = 32 g = 0.032 kg

R = universal gas constant = 8.314 J/(mol K)

T = temperature of the gas

Rms speed of oxygen molecule is given as

[tex]v = \sqrt{\frac{3RT}{M}}[/tex]

[tex]650 = \sqrt{\frac{3(8.314)T}{0.032}}[/tex]

T = 542.06 K

Answer:

1.34 x 10^3 Pa

Explanation:

density of oil = 0.85 x 10^3 kg/m^3

g = 9.81 m/s^2

height of oil column = 16.1 cm = 0.161 m

Pressure on the surface of water = height of oil column x density of oil x g

                                                      = 0.161 x 0.85 x 10^3 x 9.81 = 1.34 x 10^3 Pa

Thus, the pressure on the surface of water is 1.34 x 10^3 Pa.

Answer:

6.45 x 10^5 N/C

Explanation:

q = + e = 1.6 x 10^-19 C

m = 9.99 x 10^-27 kg

V = 13 kV = 13000 V

B = 1 T

Let v be the speed and E be the strength of electric field.

1/2 mv^2 = eV

v^2 = 2 e v / m

v^2 = (2 x 1.6 x 10^-19 x 13000) / (9.99 x 10^-27)

v = 6.45 x 10^5 m/s

As the charge particle is undeflected, the force due to magnetic field is counter balanced by the force due to electric field.

q E = q v B

E = v B = 6.45 x 10^5 x 1 = 6.45 x 10^5 N/C

The result will be the magnitude of the smallest electric field (E) required for the 6Li ions to pass through the magnetic field undeflected.

Here's how to calculate the strength of the electric field required for the 6Li ions to pass through the magnetic field undeflected:

Force Balance:

For the ions to move undeflected, the magnetic force acting on them needs to be balanced by the electric force acting in the opposite direction.

Magnetic Force:

The magnetic force (F_magnetic) on a charged particle moving through a magnetic field is given by: F_magnetic = q * v * B

Where:

q is the charge of the particle (q = +e for 6Li ion)

v is the velocity of the particle

B is the magnetic field strength

Electric Force:

The electric force (F_electric) on the charged particle in an electric field (E) is: F_electric = q * E

Balancing Forces:

For undeflected motion: F_magnetic = F_electric

Substitute the expressions from steps 2 and 3: q * v * B = q * E

Solving for Electric Field (E):

Since the charge (q) of the ion appears on both sides, we can cancel it.

E = v * B

Finding Ion Velocity (v):

The ions are accelerated by a potential difference (V) of 13 kV (13000 V).

The potential difference is related to the ion's kinetic energy (KE) by: KE = q * V

Assuming the ion starts from rest, all the potential energy is converted to kinetic energy.

KE = 1/2 * m * v^2 (where m is the mass of the ion)

Solve for v:

Combine equations from steps 6: 1/2 * m * v^2 = q * V

Solve for v: v = sqrt( 2 * q * V / m )

Substitute v in the equation for E (from step 5):

E = sqrt( 2 * q * V / m ) * B

Plug in the values:

q = +e (elementary charge = 1.602 x 10^-19 C)

V = 13000 V

m = 9.99 x 10^-27 kg

B = 1.0 T

Calculate E using the above values and the constant for elementary charge.

Answer:

The amplifier gain is 30 dB.

(c) is correct option.

Explanation:

Given that,

Output power = 100 mW

Input power = 0.1 mW

We need to calculate the amplifier gain in dB

Using formula of power gain

[tex]a_{p}=10\ log_{10}(A_{p})[/tex]....(I)

We calculate the [tex]A_{p}[/tex]

[tex]A_{p}=\dfrac{P_{o}}{P_{i}}[/tex]

[tex]A_{p}=\dfrac{100}{0.1}[/tex]

[tex]A_{p}=1000[/tex]

Now, put the value of  [tex]A_{p}[/tex] in equation (I)

[tex]a_{p}=10\ log_{10}(1000)[/tex]

[tex]a_{p}=10\times log_{10}10^{3}[/tex]

[tex]a_{p}=10\times 3log_{10}10[/tex]

[tex]a_{p}=30\ dB[/tex]

Hence, The amplifier gain is 30 dB.

The gain of an amplifier, given a power output of 100 mW and an input power of 0.1 mW, can be calculated using the gain formula in decibels, which results in a gain of 30 dB.

In this context, the gain of the amplifier can be calculated using the formula for Gain in decibels (dB), which is 10 times the log base 10 of the output power divided by the input power. Therefore, we first divide 100 mW by 0.1 mW, which gives us 1000. Taking the log base 10 of 1000 returns 3, and multiplying 3 by 10 gives us a gain of 30 dB.

So the correct answer to your question: 'An amplifier has a power output of 100 mW when the input power is 0.1 mW, what is the amplifier gain?' is option c which states that the gain is 30 dB.

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Answer:

Major term is 'things that provide intense gravity'

Minor term is 'extremely dense objects'

Middle term is 'neutron stars'

Explanation:

Answer:

Weight in planet X = 0.413 N

Explanation:

Weight = Mass x Acceleration due to gravity.

W = mg

Mass, m = 100 g = 0.1 kg

We have equation of motion s = ut + 0.5 at²

Displacement, s = 10 m

Initial velocity, u = 0 m/s

Time, t = 2.2 s

Substituting

        s = ut + 0.5 at²

        10 = 0 x 2.2 + 0.5 x a x 2.2²        

        a = 4.13 m/s²

Acceleration due to gravity, a = 4.13 m/s²

W = mg = 0.1 x 4.13 = 0.413 N

Weight in planet X = 0.413 N

In Planet X, a 100-g ball is released from rest from a height of 10.0 m and it takes 2.2 s for it to reach the ground. The weight of the ball on the surface of Planet X is 0.41 N.

In physics, gravitational acceleration is the acceleration of an object in free fall within a vacuum (and thus without experiencing drag).

A 100-g (m) ball is released from rest from a height of 10.0 m (s) and it takes 2.2 s (t) for it to reach the ground. We can calculate the gravitational acceleration using the following kinematic equation.

s = 1/2 × g × t²

g = 2 s / t² = 2 (10.0 m) / (2.2 s)² = 4.1 m/s²

We will use Newton´s second law of motion.

w = m × g = 0.100 kg × 4.1 m/s² = 0.41 N

In Planet X, a 100-g ball is released from rest from a height of 10.0 m and it takes 2.2 s for it to reach the ground. The weight of the ball on the surface of Planet X is 0.41 N.

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Answer:

Spongebob: Bye Mr. Krabs! Bye Squidward! BYE SQUIDWARD!

Patrick: (clearly triggered) Why'd you say "bye squidward" twice?

Spongebob: I LiKe SqUiDwArD

The International Space Station's operational weight in orbit is effectively zero due to its state of continuous free-fall around Earth, even though the gravitational force at its altitude is not significantly less than on Earth's surface.

The question relates to the weight of the International Space Station (ISS) when in orbit. Weight in physics is defined as the force exerted on an object due to gravity, calculated as the product of mass and gravitational acceleration (g). On Earth's surface, g is approximately 9.81 m/s2, but this value decreases with altitude due to the equation g = GME / r2, where G is the gravitational constant, ME is Earth's mass, and r is the distance from Earth's center. At the ISS's altitude (> 350 km), g is about 8.75 m/s2. However, it's crucial to understand that while the ISS has a significant mass, leading to a large weight calculation on Earth, its apparent weight in orbit is effectively zero due to it being in a continuous free-fall state around Earth, experiencing microgravity. This explains why astronauts appear weightless, even though the actual gravitational force at that altitude is not much less than on Earth's surface. Therefore, while the ISS has a calculable weight based on its mass and Earth's gravitational pull at its altitude, its operational weight in orbit, in terms of the experience within it, is zero.

Answer:

The answer is 1.1A

Explanation:

See the attached file

Answer:

14.82 Volts

Explanation:

[tex]V_{back}[/tex] = Back emf of the motor

[tex]V_{battery}[/tex] = battery voltage = 17.2 Volts

[tex]i_{locked}[/tex] = Current in locked condition = 12.3 A

R = resistance

In locked condition, using ohm's law

[tex]R = \frac{V_{battery}}{i_{locked}}[/tex]

[tex]R = \frac{17.2}{12.3}[/tex]

R = 1.4 Ω

[tex]i_{normal}[/tex] = Current in normal condition = 1.7 A

Back emf of the motor is given as

[tex]V_{back}[/tex] = [tex]V_{battery}[/tex] - [tex]i_{normal} R[/tex]

[tex]V_{back}[/tex] = 17.2 - (1.7 x 1.4)

[tex]V_{back}[/tex] = 14.82 Volts

Answer:

The tip of the needle to move from the highest point to the lowest point in 0.4 sec and the needle tip to travel a total distance in 0.9 sec.

Explanation:

Given that,

Frequency = 2.5 Hz

Amplitude = 1.27 cm

(a). We need to calculate the time

The frequency is the reciprocal of the time.

[tex]f=\dfrac{1}{T}[/tex]

[tex]T=\dfrac{1}{f}[/tex]

[tex]T=\dfrac{1}{2.5}[/tex]

[tex]T=0.4\ sec[/tex]

The time taken from highest point to lowest point

[tex]T'=\dfrac{T}{2}[/tex]

[tex]T'=\dfrac{0.4}{2}[/tex]

[tex]T'=0.2\ sec[/tex]

(b).  We need to calculate the time

The time taken in one cycle = 0.4 sec

The distance covered  in one sec= 4 times x amplitude

[tex]d=4\times1.27[/tex]

[tex]d=5.08\ m[/tex]

We need to calculate the speed

Using formula of speed

[tex]v=\dfrac{5.08}{0.4}[/tex]

[tex]v=12.7[/tex]

We need to calculate the time

[tex]t=\dfrac{11.43}{12.7}[/tex]

[tex]t= 0.9 sec[/tex]

Hence,  The tip of the needle to move from the highest point to the lowest point in 0.4 sec and the needle tip to travel a total distance in 0.9 sec.

The amount of time it took the tip of the needle to move from the highest point to the lowest point in its travel is equal to 0.2 seconds.

Given the following data:

Mathematically, the frequency of an object in simple harmonic motion is give by:

[tex]F=\frac{1}{T} \\\\T=\frac{1}{F}\\\\T=\frac{1}{2.5}[/tex]

T = 0.4 seconds.

Now, we can calculate the time it took the needle to move from the highest point to the lowest point:

[tex]t = \frac{T}{2} \\\\t = \frac{0.4}{2}[/tex]

Time, t = 0.2 seconds.

The distance traveled by the needle per seconds is given by:

[tex]d=4A\\\\d=4 \times 1.27\\\\[/tex]

Distance, d = 5.08 cm.

For the speed:

[tex]Speed = \frac{distance}{time} \\\\Speed =\frac{5.08}{0.4}[/tex]

Speed = 12.7 cm/s.

For the time:

[tex]Time = \frac{distance}{speed} \\\\Time =\frac{11.43}{12.7}[/tex]

Time = 0.9 seconds.

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The speed of an electron with a kinetic energy of 1.25 eV is approximately 1.57 x 10⁶ m/s, and the speed of a proton with the same kinetic energy is approximately 5.29 x 10⁵ m/s.

To calculate the speed of an electron and a proton with a kinetic energy of 1.25 electron volts (eV), we can use the kinetic energy formula and relate it to the speed of the particles. The kinetic energy (KE) of a particle is given by:

KE = (1/2) * m * v²

Where:

KE = kinetic energy

m = mass of the particle

v = speed of the particle

We are given the kinetic energy in electron volts (eV), but we need to convert it to joules (J) since the mass is given in kilograms (kg). The conversion factor is 1 eV = 1.60219 x 10⁻¹⁹ J.

So, the kinetic energy in joules is:

KE = 1.25 eV * 1.60219 x 10⁻¹⁹ J/eV = 2.0027375 x 10⁻¹⁹ J

Now, we can rearrange the kinetic energy formula to solve for the speed (v):

v = √((2 * KE) / m)

For an electron:

Mass of electron (mₑ) = 9.11 x 10⁻³¹ kg

v(electron) = √((2 * 2.0027375 x 10⁻¹⁹ J) / (9.11 x 10⁻³¹ kg))

Calculating this gives us the speed of the electron.

For a proton:

Mass of proton (m_p) = 1.67 x 10⁻²⁷ kg

v(proton) = √((2 * 2.0027375 x 10⁻¹⁹ J) / (1.67 x 10⁻²⁷ kg))

Calculating this gives us the speed of the proton.

Now, let's calculate these speeds.

After performing the calculations, the speed of the electron is approximately 1.57 x 10⁶ m/s, and the speed of the proton is approximately 5.29 x 10⁵ m/s.

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Answer:

3020.68 kg/m^3

Explanation:

r = 5.25 x 10^3 km = 5.25 x 10^6 m, d = 450 km = 450 x 10^3 m

T = 2.15 hours = 2.15 x 3600 second = 7740 second

Let the density of the planet is ρ and M be the mass of planet.

The formula for the orbital velocity is

[tex]v = \sqrt{\frac{GM}{r+d}}[/tex]

Time period is given by

[tex]T = {\frac{2\pi (r+d)}{v}}[/tex]

[tex]T = \frac{2\pi (r +d)^{1.5}}{\sqrt{GM}}[/tex]

[tex]7740= \frac{2\pi (5700\times 1000)^{1.5}}{\sqrt{6.67\times 10^{-11}M}}[/tex]

M = 1.83 x 10^24 kg

Density = mass / Volume

ρ = 1.83 x 10^24 / (4/3 x 3.14 x (5.25 x 10^6)^3)

ρ = 3020.68 kg/m^3

Answer:

10042.6 ohm

Explanation:

f = 10 kHz = 10000 Hz, L = 36 mH = 0.036 H, R = 10 kilo Ohm = 10000 ohm

C = 5 nF = 5 x 10^-9 F

XL = 2 x π x f x L

XL = 2 x 3.14 x 10000 x 0.036 = 2260.8 ohm

Xc = 1 / ( 2 x π x f x C) = 1 / ( 2 x 3.14 x 10000 x 5 x 10^-9)

Xc = 3184.7 ohm

Total impedance is Z.

Z^2 = R^2  + (XL - Xc)^2

Z^2 = 10000^2 + ( 2260.8 - 3184.7 )^2

Z = 10042.6 ohm

Answer : The mass of cereal in two units are, 34.815 oz and 978.075 grams respectively.

Explanation :

As there are two systems for measuring the units which are English and Metric system.

The Metric System measured the things in meters, grams, liters, etc and adds prefixes like kilo, milli and centi to the count orders of the magnitude.

The English system measured the things in feet, inches, pounds, mile, etc.

As we are given the mass of cereal in 978 grams that means 987 grams is in metric unit. Now we have to convert metric unit into English unit.

Conversion factor used :  (1 oz = 28.350 g)

As, 28.350 grams = 1 oz

So, 987 grams = [tex]\frac{987\text{ grams}}{28.350\text{ grams}}\times 1oz[/tex]

                        =  34.815 oz

As we are given the mass of cereal in 34.5 oz that means 34.5 oz is in metric unit. Now we have to convert metric unit into English unit.

Conversion factor used :  (1 oz = 28.350 g)

As, 1 oz = 28.350 grams

So, 34.5 oz = [tex]\frac{34.5\text{ oz}}{1\text{ oz}}\times 28.350\text{ grams}[/tex]

                  =  978.075 grams

Therefore, the mass of cereal in two units are, 34.815 oz and 978.075 grams respectively.

The conversion factor from ounces to grams, divide 978 grams by 34.5 ounces, resulting in approximately 28.3 g/oz when rounded to three significant figures.

To find a conversion factor between English and metric units using the information that a box of cereal has a mass of 978 grams and 34.5 ounces, you would divide the number of grams by the number of ounces.

Conversion factor = 978 g / 34.5 oz ≈ 28.34783 g/oz

However, we need to consider significant figures in our answer. The number 34.5 has three significant figures, and the number 978 has three significant figures as well. Therefore, we can justify three significant figures in our conversion factor, giving us 28.3 g/oz as the conversion with significant figures properly accounted for.

Answer:

115 m/s, 414 km/hr

Explanation:

There are two forces acting on a skydiver: gravity and air resistance (drag).  At terminal velocity, the two forces are equal and opposite.

∑F = ma

D − mg = 0

D = mg

Drag force is defined as:

D = ½ ρ v² C A

where ρ is the fluid density,

v is the velocity,

C is the drag coefficient,

and A is the cross sectional surface area.

Substituting and solving for v:

½ ρ v² C A = mg

v² = 2mg / (ρCA)

v = √(2mg / (ρCA))

We're given values for m and A, and we know the value of g.  We need to look up ρ and C.

Density of air depends on pressure and temperature (which vary with elevation), but we can estimate ρ ≈ 1.21 kg/m³.

For a skydiver falling headfirst, C ≈ 0.7.

Substituting all values:

v = √(2 × 80.0 kg × 9.8 m/s² / (1.21 kg/m³ × 0.7 × 0.140 m²))

v = 115 m/s

v = 115 m/s × (1 km / 1000 m) × (3600 s / hr)

v = 414 km/hr

The terminal velocity of the skydiver in m/s and km/h is;  115m/s  and  414 km/h

Using Given data :

mass of skydiver ( M ) = 80 kg

Cross sectional surface area ( A ) = 0.14 m^2

p ( fluid density ) ≈ 1.21 kg/m³.

C ( drag coefficient ) = 0.7

Determine the terminal velocity of the skydiver

At terminal velocity drag force and gravity is equal and opposite therefore canceling out each other

∑ F = ma

Drag force - Mg = 0

therefore;  D = Mg ----- ( 1 )

where D ( drag force ) = 1/2 pv² C A ---- ( 2 )

p = fluid density , C = drag coefficient , A = cross sectional area

v = velocity

Back to equations 1 and 2  ( equating them )

1/2 pv² CA = Mg ---- ( 3 )

v² = 2mg / ( p C A )

∴ V = √ ( 2mg / (p C A ))

V = √ ( 2 * 80 * 9.8 ) / ( 1.21 * 0.7 * 0.140 ))

    = 115 m/s  

also  V = 414 km/h

Hence we can conclude that the terminal velocity of the skydiver is in m/s and km/h are 115m/s and  414 km/h

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Answer:

346m/s

Explanation:

v1=335m/s

f1=200hz

f2=207hz

v2=?

v1/f1=v2/f2

335/200=v2/207

v2=335*207/200

v2=346m/s

The angular velocity of the CD is 754.4 rad/s. The time it takes for the CD to rotate through 90 degrees is 0.0021 seconds. The average angular acceleration of the CD is 188.6 rad/s².

To calculate the angular velocity of the CD, we can convert the given 7200 rev/min to radians per second. Since one revolution is equal to 2π radians, we can use the conversion factor to find the angular velocity. Thus, the angular velocity of the CD is 754.4 rad/s.

To calculate the time it takes for the CD to rotate through 90 degrees, we need to find the fraction of the total rotation that corresponds to 90 degrees. Since a full rotation is 360 degrees or 2π radians, 90 degrees is equal to π/2 radians. We can then use the formula Δθ = ωΔt to find the time it takes, where Δθ is the angle in radians, ω is the angular velocity, and Δt is the time. Rearranging the formula, we have Δt = Δθ/ω. Substituting the values, we get Δt = π/2 / 754.4 = 0.0021 seconds.

The average angular acceleration can be found using the formula α = (ωf - ωi) / Δt, where α is the angular acceleration, ωf is the final angular velocity, ωi is the initial angular velocity, and Δt is the time interval. The CD starts from rest and reaches full speed in 4 seconds, so the initial angular velocity is 0. Using the given full speed of 7200 rev/min, we can convert it to radians per second and use it as the final angular velocity. Thus, the average angular acceleration is α = (754.4 rad/s - 0 rad/s) / 4 s = 188.6 rad/s².

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Answer:

q = 1.815 \times 10^{-8} C

Charge on one plate is positive in nature and on the other plate it is negative in nature.

Explanation:

E = 8.20 x 10^5 V/m, A = 25 cm^2, d = 22.45 mm

According to the Gauss's theorem in electrostatics

The electric field between the two plates

[tex]E = \frac{\sigma }{\varepsilon _{0}}[/tex]

[tex]{\sigma }= E \times {\varepsilon _{0}}[/tex]

[tex]{\sigma }= 8.20 \times 10^{5} \times {8.854 \times 10^{-12}[/tex]

[tex]{\sigma }= 7.26 \times 10^{-6} C/m^{2}[/tex]

Charge, q = surface charge density x area

[tex]q = 7.26 \times 10^{-6} \times 25 \times 10^{-4}[/tex]

q = 1.815 \times 10^{-8} C

Answer:

(a) 0.33 second

(b) 6 cm/s

Explanation:

Frequency, f = 3 waves per second

wavelength, λ = 2 cm = 0.02 m

(a) The period of wave is defined as the time taken by the wave to complete one oscillation. It is the reciprocal of frequency.

T = 1 / f = 1 / 3 = 0.33 second

(b) the relation between wave velocity, frequency and wavelength is given by

v = f x λ

v = 3 x 0.02 = 0.06 m /s

v = 6 cm /s

Final answer:

The period of the waves generated by a grasshopper in water is 0.333 seconds, and the wave velocity is 0.06 m/s.

Explanation:

Calculating the Period and Wave Velocity

When dealing with waves generated by a grasshopper floating in water, two key properties to determine are the period of the waves and the wave velocity.

(a) The Period of the Waves

The period (T) of a wave is the amount of time it takes for one complete wave cycle to pass. It can be calculated as the inverse of the frequency (f), which is the rate at which waves are generated. The formula to find the period is:

T = 1/f

In this case, the grasshopper generates waves at a frequency of 3 waves per second (3 Hz). Therefore, the period is:

T = 1/3 Hz = 0.333 seconds

(b) The Wave Velocity

The velocity (v) of a wave is determined by multiplying the frequency (f) of the wave by its wavelength (λ). The formula for wave velocity is:

v = f × λ

Here, the wavelength given is 2 cm, which we need to convert to meters (since the SI unit for velocity is m/s). Thus:

λ = 2 cm = 0.02 m

The velocity of the waves generated by the grasshopper is then:

v = 3 Hz × 0.02 m = 0.06 m/s

Explanation:

The resistance of a wire is given by :

[tex]R=\rho\dfrac{l}{A}[/tex]

Where

[tex]\rho[/tex] is the resistivity of the wire

l = initial length of the wire

A = initial area of cross section

If length and the area of cross section of the wire is doubled then new length is l' and A', l' = 2 l and A' = 2 A

So, new resistance of the wire is given by :

[tex]R'=\rho\dfrac{l'}{A'}[/tex]

[tex]R'=\rho\dfrac{l}{A}[/tex]

R' = R

So, the resistance of the wire remains the same on doubling the length and the area of wire.