Suppose a person pushes thumbtack that is 1/5 centimeter long into a bulletin board, and the force (in dynes) exerted when the depth of the thumbtack in the bulletin board is x centimeters is given by F(x) = 1000 (1 + 2x)2 for 0 ≤ x ≤ 1 5 . Find the work W done by pushing the thumbtack all the way into the board.

Answer:

option(d)

Explanation:

The frequency of a wave is the property of the source of wave.

The velocity of all the electromagnetic waves is same as the speed of light. It only changes as the light passes through one medium to another.

The frequency is defined as the number of waves coming out from the source in 1 second.

As the frequency of wave increases, the number of wave coming per second increases.

So, the number of waves passing by increases but the speed remains same.

Option (d)

Answer:

6.88 mA

Explanation:

Given:

Resistance, R = 594 Ω

Capacitance = 1.3 μF

emf, V = 6.53 V

Time, t = 1 time constant

Now,

The initial current, I₀ = [tex]\frac{\textup{V}}{\textup{R}}[/tex]

or

I₀ = [tex]\frac{\textup{6.53}}{\textup{594}}[/tex]

or

I₀ = 0.0109 A

also,

I = [tex]I_0[1-e^{-\frac{t}{\tau}}][/tex]

here,

τ = time constant

e = 2.717

on substituting the respective values, we get

I = [tex]0.0109[1-e^{-\frac{\tau}{\tau}}][/tex]

or

I = [tex]0.0109[1-2.717^{-1}][/tex]

or

I = 0.00688 A

or

I = 6.88 mA

Answer: a) is the vector sum of the electric field that would be caused by each charge separately.

Explanation: In order to explain this problem we have to know the electric field can be calculated by using the superposition principle so in this case this the right answer.

All the other are false, b) never can be the field zero along a line that connect the charges because it depend on teh sign of the charge and the distance between them. c) always the electric field can be determined for charged points. d) It is possible to find a zero electric field in any point if the points charges have different sign.  

The electric field surrounding two point charges is the vector sum of the electric field that would be caused by each charge separately. So the correct answer is A.

The correct answer is a) is the vector sum of the electric field that would be caused by each charge separately. When two point charges are present, the electric field at any point is the vector sum of the electric fields caused by each charge individually. The superposition principle states that the total electric field is the sum of all individual electric fields. Therefore, the electric field surrounding two point charges is the vector sum of the electric field caused by each charge separately.

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Answer:

4500 J and 3000 J

Explanation:

According to conservation of momentum

      [tex]0 = m_1 V_1 + m_2 V_2[/tex]

Given that m_2 = 1.5 m_1 , so

    [tex]V_1 = -1.5 V_2[/tex]

  the kinetic energy of each piece is

    [tex]K_2= \frac{1}{2} m_2v_2^2[/tex]

    [tex]K_1= \frac{1}{2} m_1v_1^2[/tex]

substituting the value of V1 in the above equation

    [tex]K_1 = (1/2)( m_2 / 1.5 )( -1.5 V_2)^2 = 1.5 (1/2)m_2 V_2^2 = 1.5 K_2[/tex]

  Given that

         K_1 + k_2 = 7500 J

       1.5 K_2 + K_2 = 7500

         K_2 = 7500 / 2.5

               = 3000 J

this is the KE of heavier mass

      K_1 = 7500 - 3000 = 4500 J

this is the KE of lighter mass

The question is about finding the kinetic energy acquired by each of two pieces of an object following an internal explosion, using principles of conservation of energy and momentum in physics.

The student has asked about an internal explosion that breaks an object into two pieces with different masses, releasing a certain amount of kinetic energy in the process. This question involves applying the principle of conservation of energy and momentum to find the kinetic energy acquired by each piece post-explosion.

Assuming piece 1 has a mass of m and piece 2 has a mass of 1.5m, the total mass of the system is 2.5m. Since 7500 J of energy was released in the explosion, to find the kinetic energy of each piece, we can use the fact that the total kinetic energy is equal to the energy released during the explosion. Let the kinetic energy of the smaller piece be K1 and of the larger piece be K2. Because the object was initially at rest and momentum must be conserved, the momenta of the two pieces must be equal and opposite. This relationship allows us to derive the ratio of the kinetic energies. We can solve for K1 and K2 proportionally. Finally, because the kinetic energy is a scalar quantity, adding the kinetic energies of the two pieces will equal the total energy released.

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Answer:

b. It is dropped

Explanation:

If the initial velocity is zero, the object move from rest. That happens if the object is dropped

Answer:

[tex]E=2.0*10^{11}N/m^{2}[/tex]

Explanation:

Relation between stress and Force:

[tex]\sigma=\frac{F}{A}=\frac{F}{\pi*d^{2}/4}[/tex]

Relation between stress and strain:

Young's modulus is defined by the ratio of longitudinal stress σ , to the longitudinal strain ε:

[tex]E=\frac{\sigma}{\epsilon}[/tex]

[tex]\epsilon=\frac{\Delta l}{l}[/tex]

So:

[tex]E=\frac{F*l}{\pi*d^{2}/4*\Delta l}=\frac{50*10^{6}*3}{\pi*(0.4^{2}/4)*5.967*10^{-3}}=2*10^{11}N/m^2[/tex]

Explanation:

It is given that,

Initial state of electron, [tex]n_i=1[/tex]

Final state of electron, [tex]n_f=3[/tex]

The wavelength of the excited electron is given by :

[tex]\dfrac{1}{\lambda}=R(\dfrac{1}{n_f^2}-\dfrac{1}{n_i^2})[/tex]

Where

R is Rydberg's constant

[tex]\dfrac{1}{\lambda}=1.097\times 10^{7}\ J\times (\dfrac{1}{3^2}-\dfrac{1}{1^2})[/tex]

[tex]\lambda=-1.02\times 10^{-7}\ m[/tex]

or

[tex]\lambda=102\ nm[/tex]

Let f is the frequency of the observed photon. It is given by :

[tex]f=\dfrac{c}{\lambda}[/tex]

[tex]f=\dfrac{3\times 10^8\ m/s}{1.02\times 10^{-7}\ m}[/tex]

[tex]f=2.94\times 10^{15}\ Hz[/tex]

Hence, this is the required solution.

Answer:

1.032 x 10^-7 m, 2.9 x 10^15 Hz

Explanation:

n = 1 to n = 3

Rydberg's constant, R = 1.09 × 10^7 per metre

Use the formula for the wavelength

[tex]\frac{1}{\lambda }=R\left ( \frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}} \right )[/tex]

here, n1 = 1 and n2 = 3

[tex]\frac{1}{\lambda }=1.09\times 10^{7}\left ( \frac{1}{1^{2}}-\frac{1}{3^{2}} \right )[/tex]

[tex]\frac{1}{\lambda }=1.09\times 10^{7}\times \frac{8}{9}[/tex]

λ = 1.032 x 10^-7 m

Let the frequency is f.

Use the relation

v = f x λ

[tex]3 \times 10^8=f\times 1.032 \times 10^{-7}[/tex]

f = 2.9 x 10^15 Hz

Answer:

The weight required on the piston equals 420 Newtons.

Explanation:

from the principle of transmission of pressure in a hydraulic lift  we have

[tex]\frac{F_{1}}{A_{1}}=\frac{F_{2}}{A_{1}}[/tex]

where

'F' is the force that acts on the piston

'A' is the area of the piston.

Since the force in the question is 21000 Newtons thus upon putting the values in the above equation we get

[tex]\frac{21000}{3.0m^{2}}=\frac{W}{0.06m^{2}}[/tex]

Solving for [tex]W[/tex] we get

[tex]W=\frac{21000}{3}\times 0.06\\\\\therefore W=420Newtons[/tex]

To lift an object weighing 21,000 N using a piston with an area of 0.060 m² and a platform of 3.0 m², you need a force of 420 N on the smaller piston.

To solve this problem, we need to use the principle of hydraulic systems which states that the pressure in one piston is equal to the pressure in the other piston.

The formula for pressure is:

P = F / A

where P is pressure, F is force, and A is area.

Given:

First, calculate the pressure exerted by the object on the larger platform:

P = F / A = 21,000 N / 3.0 m² = 7,000 Pa

Since the pressure is the same in the smaller piston, we can now find the force needed on the smaller piston:

F = P × A = 7,000 Pa × 0.060 m² = 420 N

Thus, a force of 420 N is required on the smaller piston to lift the object weighing 21,000 N.

The area of a room with length 9.72 m and width 5.3 m is 52 m² when rounded to two significant figures.

The area of a room can be calculated using the formula: Area = Length × Width. For this room, with a length of 9.72 m and a width of 5.3 m, plug the values into the formula: Area = 9.72 m × 5.3 m. Calculate to get an area of 51.516 m². However, since the values given for length and width only have two significant figures, we should round our answer to have the same. So, the area of the room, rounded to two significant figures, is 52 m².

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Answer:

a) 32.58 m/s²

b) 161.84 m/s

Explanation:

Initial velocity = u = 0

Final velocity = v = 145 m/s

Time taken = t = 4.45 s

s = Displacement of dragster = 402 m

a = Acceleration

[tex]v=u+at\\\Rightarrow a=\frac{v-u}{t}\\\Rightarrow a=\frac{145-0}{4.45}\\\Rightarrow a=32.58\ m/s^2[/tex]

[tex]v^2-u^2=2as\\\Rightarrow v=\sqrt{2as-u^2}\\\Rightarrow v=\sqrt{2\times 32.58\times 402-0^2}\\\Rightarrow v=161.84\ m/s[/tex]

The final velocity is greater than the velocity used to find the average acceleration due to the gear changes. The first gear in a dragster has the most amount of toque which means the acceleration will be maximum. The final gears have less torque which means the acceleration is lower here. The final gears have less acceleration but can spin faster which makes the dragster able to reach higher speeds but slowly.

Answer:

[tex]\rm |q_1|=8.0\times 10^{-7}\ C,\ \ \ |q_2| = 4.6\times 10^{-6}\ C.[/tex]

Explanation:

According to the Coulomb's law, the magnitude of the electrostatic force between two static point charges  [tex]\rm q_1[/tex] and [tex]\rm q_1[/tex], separated by a distance [tex]\rm r[/tex], is given by

[tex]\rm F = \dfrac{kq_1q_2}{r^2}.[/tex]

where k is the Coulomb's constant.

Initially,

[tex]\rm r = 0.160\ m\\F_i = -1.30\ N.\\\\and \ \ |q_2|>|q_1|.[/tex]

The negative sign is taken with force F because the force is attractive.

Therefore, the initial electrostatic force between the charges is given by

[tex]\rm F_i = \dfrac{kq_1q_2}{r^2}.\\-1.30=\dfrac{kq_1q_2}{0.160^2}\\\rm\Rightarrow q_2 = \dfrac{-1.30\times 0.160^2}{q_1k}\ \ \ ..............\ (1).[/tex]

Now, the objects are then brought into contact, so the net charge is shared equally, and then they are returned to their initial positions.

The force is now repulsive, therefore, [tex]\rm F_f = +1.30\ N.[/tex]

The new charges on the two objects are

[tex]\rm q_1'=q_2' = \dfrac{q_1+q_2}{2}.[/tex]

The new force is given by

[tex]\rm F_f = \dfrac{kq_1'q_2'}{r^2}\\+1.30=\dfrac{k\left (\dfrac{q_1+q_2}{2}\right )\left (\dfrac{q_1+q_2}{2}\right )}{0.160^2}\\\Rightarrow \left (\dfrac{q_1+q_2}{2}\right )^2=\dfrac{+1.30\times 0.160^2}{k}\\(q_1+q_2)^2=\dfrac{4\times 1.30\times 0.160^2}{k}\\q_1^2+q_2^2+2q_1q_2=\dfrac{4\times 1.30\times 0.160^2}{k}\\\\[/tex]

Using (1),

[tex]\rm q_1^2+\left ( \dfrac{-1.30\times 0.160^2}{q_1k}\right )^2+2\left (\dfrac{-1.30\times 0.160^2}{k} \right )=\dfrac{4\times 1.30\times 0.160^2}{k}\\q_1^2+\dfrac 1{q_1^2}\left ( \dfrac{-1.30\times 0.160^2}{k}\right )^2-\left (\dfrac{6\times 1.30\times 0.160^2}{k} \right )=0\\q_1^4+\left ( \dfrac{-1.30\times 0.160^2}{k}\right )^2-q_1^2\left (\dfrac{6\times 1.30\times 0.160^2}{k} \right )=0[/tex]

[tex]\rm q_1^4+\left ( \dfrac{-1.30\times 0.160^2}{k}\right )^2-q_1^2\left (\dfrac{6\times 1.30\times 0.160^2}{k} \right )=0\\q_1^4+\left ( \dfrac{-1.30\times 0.160^2}{9\times 10^9}\right )^2-q_1^2\left (\dfrac{6\times 1.30\times 0.160^2}{9\times 10^9} \right )=0\\q_1^4-q_1^2\left (\dfrac{6\times 1.30\times 0.160^2}{9\times 10^9} \right )+\left ( \dfrac{-1.30\times 0.160^2}{9\times 10^9}\right )^2=0[/tex]

[tex]\rm q_1^4-q_1^2\left (2.22\times 10^{-11} \right )+\left ( 1.37\times 10^{-23}\right ) =0\\\Rightarrow q_1^2 = \dfrac{-(-2.22\times 10^{-11})\pm \sqrt{(-2.22\times 10^{-11})^2-4\cdot (1)\cdot (1.37\times 10^{-23})}}{2}\\=1.11\times 10^{-11}\pm 1.046\times 10^{-11}.\\=6.4\times 10^{-13}\ \ \ or\ \ \ 2.156\times 10^{-11}\\\Rightarrow q_1 = \pm 8.00\times 10^{-7}\ C\ \ \ or\ \ \ \pm 4.64\times 10^{-6}\ C.[/tex]

Using (1),

When [tex]\rm q_1 = \pm 8.00\times 10^{-7}\ C[/tex],

[tex]\rm q_2=\dfrac{-1.30\times 0.160^2}{\pm 8.00\times 10^{-7}\times 9\times 10^9}=\mp4.6\times 10^{-6}\ C.[/tex]

When [tex]\rm q_1=\pm 4.6\times 10^{-6}\ C[/tex],

[tex]\rm q_2=\dfrac{-1.30\times 0.160^2}{\pm 4.64\times 10^{-6}\times 9\times 10^9}=\mp7.97\times 10^{-7}\ C\approx 8.0\times 10^{-7}\ C.[/tex]

Since, [tex]\rm |q_2|>|q_1|[/tex]

Therefore, [tex]\rm |q_1|=8.0\times 10^{-7}\ C,\ \ \ |q_2| = 4.6\times 10^{-6}\ C.[/tex]

To convert 1g of ice at absolute zero to 1g of boiling water, we need to calculate the heat required in three stages: heating the ice to melting point, melting the ice to water, and heating the water to boiling point. Adding the heat required for these three stages, we find the total amount of heat required is approximately 316.38 cal.

To find the total heat needed to turn 1 g of ice at absolute zero to boiling water, we calculate it in three parts. First, we calculate the heat required to raise the temperature of ice from absolute zero (-273.15 degrees Celsius) to 0 degrees Celsius using the formula: Q = mcΔT where m = 1g, c = 0.5 cal/(g*C), and ΔT = 273.15 °C. This gives us 136.58 cal.

Second, we need to factor in the heat needed to convert the ice at 0 degree Celsius to water at 0 degree Celsius. The heat of fusion for ice is known as 79.8 cal/g, so for 1 gram, the heat would be 79.8 cal.

Third, we calculate the heat needed from water at 0 degrees to water boiling point (100 degrees C). Here the formula remains the same but specific heat capacity changes to 1 cal/(g*C), which results in 100 cal.

Adding the calculated heat amounts for each phase gives the total heat required. Hence, the total amount of heat needed is 136.58 cal + 79.8 cal + 100 cal = 316.38 cal.

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Answer with Explanation:

The position of the particle as a function of time is given by [tex]s(t)=t^2-26t+133[/tex]

Part 1) The position as a function of time is shown in the below attached figure.

Part 2) By the definition of velocity we have

[tex]v=\frac{ds}{dt}\\\\\therefore v(t)=\frac{d}{dt}\cdot (t^2-26t+133)\\\\v(t)=2t-26[/tex]

The velocity as a function of time is shown in the below attached figure.

Part 3) The displacement of the particle in the first 19 seconds is given by [tex]\Delta x=s(19)-s(0)\\\\\Delta x=(19^2-26\times 19+133)-(0-0+133)=-133millimeters[/tex]

Part 4) The distance covered in the first 19 seconds can be found by evaluating the integral

[tex]s=\int _{0}^{19}\sqrt{1+(\frac{ds}{dt})^2}\\\\s=\int _{0}^{19}\sqrt{1+(2t-26)^2}\\\\\therefore s=207.03meters[/tex]

Part 4) As we can see that the position-time graph is parabolic in shape hence we conclude that the motion is uniformly accelerated motion.

Answer:

(a) [tex]L_{D} = 1.052\times 10^{- 4} m[/tex]

N = [tex]4.87\times 10^{4}[/tex]

(b) [tex]L'_{D} = 5.531\times 10^{- 6} m[/tex]

N' = [tex]7.087\times 10^{- 4}[/tex]

(c) [tex]L''_{D} = 4.43\times 10^{- 13} m[/tex]

N'' = [tex]3.63\times 10^{- 14}[/tex]

Solution:

As per the question, we have to calculate the Debye, [tex]L_{D}[/tex] length and N for the given cases.

Also, we utilize the two relations:

1. [tex]L_{D} = \sqrt{\frac{KT\epsilon_{o}}{ne^{2}}}[/tex]

2. N = [tex]\frac{4}{3}n\pi(L_{D})^{3}[/tex]

Now,

(a) n = [tex]10^{10} cm^{- 3}\times (10^{- 2})^{- 3} = 10^{16} m^{- 3}[/tex]

KT = 2 eV

Then

[tex]L_{D} = \sqrt{\frac{2\times 1.6\times 10^{- 19}\times 8.85\times 10^{- 12}}{10^{16}(1.6\times 10^{- 19})^{2}}}[/tex]

(Since,

e = [tex]1.6\times 10^{- 19} C[/tex]

[tex]\epsilon_{o} = 8.85\times 10^{- 12} F/m[/tex])

Thus

[tex]L_{D} = 1.052\times 10^{- 4} m[/tex]

Now,

N = [tex]\frac{4}{3}\times 10^{16}\pi(1.052\times 10^{- 4})^{3} = 4.87\times 10^{4}[/tex]

(b) n = [tex]10^{6} cm^{- 3}\times (10^{- 2})^{- 3} = 10^{12} m^{- 3}[/tex]

KT = 0.1 eV

Then

[tex]L'_{D} = \sqrt{\frac{0.1\times 1.6\times 10^{- 19}\times 8.85\times 10^{- 12}}{10^{12}(1.6\times 10^{- 19})^{2}}}[/tex]

[tex]L'_{D} = 5.531\times 10^{- 6} m[/tex]

N' = [tex]\frac{4}{3}\times 10^{12}\pi(5.531\times 10^{- 6})^{3} = 7.087\times 10^{- 4}[/tex]

(c) n = [tex]10^{17} cm^{- 3}\times (10^{- 2})^{- 3} = 10^{23} m^{- 3}[/tex]

KT = 800 eV

[tex]L''_{D} = \sqrt{\frac{800\times 1.6\times 10^{- 19}\times 8.85\times 10^{- 12}}{10^{23}(1.6\times 10^{- 19})^{2}}}[/tex]

[tex]L''_{D} = 4.43\times 10^{- 13} m[/tex]

N'' = [tex]\frac{4}{3}\times 10^{23}\pi(4.43\times 10^{- 13})^{3} = 3.63\times 10^{- 14}[/tex]

Answer:

ΔTmin = 3.72 °C

Explanation:

With a 16-bit ADC, you get a resolution of [tex]2^{16}=65536[/tex] steps. This means that the ADC will divide the maximum 10V input into 65536 steps:

ΔVmin = 10V / 65536 = 152.59μV

Using the thermocouple sensitiviy we can calculate the smallest temperature change that 152.59μV represents on the ADC:

[tex]\Delta Tmin = \frac{\Delta Vmin}{41 \mu V/C}= 3.72 C[/tex]

Answer:

[tex]3.33\times 10^{-4}[/tex] C

Explanation:

[tex]E[/tex] = Maximum electric field strength = [tex]3\times 10^{6}[/tex] N/C

[tex]r[/tex] = Radius of the sphere  = [tex]1 [/tex] m

[tex]Q[/tex] = maximum charge stored by the sphere  = ?

Considering that the total charge is stored at the center of the sphere, the electric field at the surface of sphere can be given as

[tex]E=\frac{kQ}{r^{2}}[/tex]

Inserting the values for the variables in the above equation

[tex]3\times 10^{6}=\frac{(9\times 10^{9})Q}{1^{2}}[/tex]

[tex]3\times 10^{6}=(9\times 10^{9})Q[/tex]

Dividing both side by [tex](9\times 10^{9})[/tex]

[tex]\frac{3\times 10^{6}}{9\times 10^{9}}= \frac{9\times 10^{9}}{9\times 10^{9}}Q[/tex]

[tex]Q = \frac{3\times 10^{6}}{9\times 10^{9}}[/tex]

[tex]Q = 3.33\times 10^{-4}[/tex] C

Answer:

256 x 10³ Nm

Explanation:

Force on each of the charges of 8 C due to uniform electric field in x -y plane  will be equal and opposite because one is positive charge and the other is negative charge. They will make a couple

Each of the forces of the couple will act in x - y plane and will be equal to

F = Q E = 8 X 8 X 10³

= 64 X 10³ N

Arm of the couple = 4 m

Moment of couple about z axis.

= 64 x 10³ x 4

= 256 x 10³ Nm.

The magnitude of the net torque applied to the rod in a perpendicular electric field is calculated using the product of the force on one charge by the electric field, the distance from the origin, and considering that there are two opposite forces creating the torque.

In this Physics problem, we are asked to calculate the magnitude of the net torque applied to a thin rod which has point charges at its ends, placed in a perpendicular electric field. The charges are +8.0C and -8.0C, and the electric field has a magnitude of 8.0 × 10³ N/C. Torque (τ) is given by the cross product of the position vector (r) and the force vector (F), or τ = r × F. Given that the electric field E is perpendicular to the rod and applying a force (F = E × q) on each charge, the torque for each charge will be τ = rF sin(θ), where θ is the angle between r and the direction of the force, which in this case is 90 degrees.

The charge at the positive end of the rod experiences a downward force, while the charge at the negative end experiences an upward force. Both forces will be equal in magnitude but opposite in direction, which leads to a torque that tries to rotate the rod around the z-axis. Therefore, the magnitude of net torque will be twice that of one charge, since the rod has a charge on each end and the forces act at a distance (2.0 m from the origin for both charges). Thus, the magnitude of the net torque can be found with τ = 2 × (2.0 m × 8.0 × 10³ N/C × 8.0C).

Answer:

W_planet=(W_earth*a)/g

Explanation:

The mass of the object does not change. It is the same at Earth and at the other planet.

W_earth=Mg       weight at Earth

W_planet=Ma       weight at other planet

If we divide the last equations:

W_planet/W_earth=a/g

W_planet=(W_earth*a)/g

Answer:

- 1.65 × 10⁻⁷ C

Explanation:

Given:

Sides of the cube = 30 cm long

Electric flux, φ = - 3.1 kN.m²/C = - 3.1 × 10³ N.m²/C

Now,

For the cube,

The charge using the Gauss law is given as:

q = ε₀ × (nφ)

Here,

q is the charge

ε₀ = 8.85 × 10⁻¹² C²/N.m²

n is the number of sides for the cube = 6

Thus,

q = 8.85 × 10⁻¹² × 6 × (- 3.1 × 10³ )

or

q = - 1.65 × 10⁻⁷ C

Answer:

time required to mow lawn is 1274.06 minutes

Explanation:

given data

average mow = 1400 square meters each hour

area = 320000 square feet

to find out

How many minutes will take to mow lawn

solution

we know that here 1 square feet is equal to 0.092903 square meter

so 320000 square feet will be = 0.09203 × 320000 = 29728.9728 square meter

so time required is express as

time required = [tex]\frac{distance}{speed}[/tex]

time required = [tex]\frac{29728.9728}{1400}[/tex]

time required = 21.23 hours

so time required = 21.23 × 60 min = 1274.06

time required to mow lawn is 1274.06 minutes

To calculate the magnitude of the charge that creates a 4.70 N/C electric field at a point 3.70 m away, we can use Coulomb's law. The magnitude of the charge is approximately 2.58 * 10^(-6) C.

To calculate the magnitude of the charge that creates a 4.70 N/C electric field at a point 3.70 m away, we can use Coulomb's law. Coulomb's law states that the electric field is equal to the force exerted by the charge, divided by the distance squared. The equation is:

E = k * (q / r^2)

where E is the electric field, q is the charge, r is the distance, and k is the electrostatic constant.

In this case, we are given the electric field (4.70 N/C) and the distance (3.70 m). Plugging these values into the equation, we can solve for the magnitude of the charge:

4.70 N/C = k * (q / (3.70 m)^2)

Simplifying the equation, we have:

q = (E * r^2) / k

q = (4.70 N/C * (3.70 m)^2) / k

Using the given values of the electrostatic constant and performing the calculation, we find that the magnitude of the charge is approximately 2.58 * 10^(-6) C.

Answer:

the velocity of car when it passes the truck is u = 16.33 m/s

Explanation:

given,

constant speed of truck  = 28 m/s

acceleration of car = 1.2 m/s²

passes the truck in 545 m

speed of the car when it just pass the truck = ?

time taken by the truck to travel 545 m

              time =[tex]\dfrac{distance}{speed}[/tex]

              time =[tex]\dfrac{545}{28}[/tex]

              time =19.46 s

velocity of the car when it crosses the truck

[tex]S = ut + \dfrac{1}{2}at^2[/tex]

[tex]545= u\times 19.46 + \dfrac{1}{2} \times 1.2 \times 19.46^2[/tex]

u = 16.33 m/s

the velocity of car when it passes the truck is u = 16.33 m/s

Answer:[tex]\theta =27.26^{\circ}[/tex]

Explanation:

Given

Vector A has magnitude of 5 units

Vector B has magnitude of 9 units

Dot product of A and B is 40

i.e.

[tex]A\cdot B=|A||B|cos\theta [/tex]

[tex]40=5\times 9\times cos\theta [/tex]

[tex]cos\theta =\frac{8}{9}=0.889[/tex]

[tex]\theta =27.26^{\circ}[/tex]

The distance between the two ships after two hours can be found using vector addition and the law of cosines, and the relative speed of ship A as seen by ship B is determined by subtracting the velocity vector of ship B from that of ship A.

The question asks to determine the distance between two ships two hours after their departure from the same port and the relative speed of ship A as seen from ship B. To solve this, we need to apply the concepts of vector addition and use trigonometry.

First, we find the vectors of the individual ships' movements. Ship A travels at 40 mph in a direction 35° west of north, and Ship B travels at 20 mph 80° east of north.

To find the distance between the two ships after two hours, we'll calculate each ship's displacement (speed multiplied by time) for two hours and then use trigonometry to determine the resultant displacement vector between the two ships. Using the law of cosines, we can find the distance between the ships. To find the relative speed of ship A from B, we will subtract the velocity vector of B from A.

These steps will yield the answers to the question after proper calculations.

Answer:

a) The magnitude of the car's total displacement (T) from the starting point is T = 82.67 Km

b) The angle (θ) from east of the car's total displacement measured from the starting direction is θ = 40.88 °

Explanation:

Attached you can see a diagram of the problem.

a) Find the magnitude of the vector T that goes from point A to point D (see the diagram).

The x and y components of this vector are

[tex]T_x=48+29*sin(30)=62.5 Km\\T_y=29+29*cos(30) = 54.11 Km[/tex]

The magnitude of the vector is find using the pythagoras theorem:

[tex]a^2=b^2+c^2[/tex], being a, b and c the 3 sides of the triagle that forms the vector:

[tex]T^2=T_x^2+T_y^2\\T=\sqrt{T_x^2+T_y^2}[/tex]

Replacing the values

[tex]T=\sqrt{(62.5)^2+(54.11)^2} \\T=82.67 Km[/tex]

b) Find the angle θ that forms the vector T and the vector AB (see diagram).

To find this angle you can use the inverse tangent

θ[tex]=tan^{-1}(\frac{T_y}{T_x})[/tex]

θ[tex]=tan^{-1}(\frac{54.11}{62.5})[/tex]

θ=40.88°

To calculate the electric field at the center of the square, we use the Coulomb's law formula for each charge located at the corners of the square. We then compute the vector sum of these electric fields, taking into account the direction of each field.

First, we use Coulomb's law formula to calculate the electric field created by a single charge, which is E = kQ/r², where E is the electric field, k is Coulomb's constant (8.99 x 10⁹ N.m²/C²), Q is the charge and r is the distance from the charge.

We calculate the electric field at the center of the square due to each charge separately. The electric field due to the -38.6 μC charge is E1 = kQ/r² = 8.99 x 10⁹ N.m²/C² * -38.6 x 10⁻⁶C/(0.425m/√2)², and similarly, the electric field due to each -27.0μC charge is E2 = kQ/r² = 8.99 x 10⁹ N.m²/C² * -27.0 x 10⁻⁶C/(0.425m/√2)².

The total electric field is simply the vector sum of the individual fields which would involve figuring out the geometric relationship between the individual electric fields. An important note is, electric fields from negative charges are directed towards the charges, so the directions of the fields must be taken into account while adding.

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Answer:

boy average velocity to catch the ball just before it hits the ground is 8.53 m/s

Explanation:

given data

vertical distance = 75.1 m

horizontal distance = 33.4 m

to find out

Find the average velocity to catch the ball just before it hits the ground

solution

we know here ball is coming downward and boy is running to catch it

so first we calculate the time of ball to reach at ground that is express by equation of motion

s = ut + 0.5 × at²    .....................1

here u is initial speed that is zero and a = 9.8 and s is distance

put here all value to get time t  in equation 1

75.1 = 0 + 0.5 × (9.8)t²  

t = 3.914 s

so

boy speed is = [tex]\frac{distance}{time}[/tex]

speed = [tex]\frac{33.4}{3.914}[/tex]

speed = 8.53 m/s

so average velocity to catch the ball just before it hits the ground is 8.53 m/s

Answer:

The length of the rod is 0.6 m

Solution:

Mass of the copper rod, m = 100 g = 0.1 kg

Angular speed at lowest position, [tex]\omega_{L} = 7 rad/s[/tex]

Now,

By using the law of conservation of energy, the overall mechanical energy of the system taken about the center of mass remain conserve.

Thus at the initial position of the rod, i.e., horizontal:

[tex]\frac{1}{2}mv_{c}^{2} + \frac{1}{2}I\omega^{2} + mg\frac{L}{2} =0 + mg\frac{L}{2}[/tex]

[tex]\frac{1}{2}mv_{c}^{2} + \frac{1}{2}I\omega^{2} = 0[/tex]

(Since, [tex]v_{c} = 0[/tex] and [tex]\omega = 0[/tex] at horizontal position).

where

Tranlational Kinetic energy about center of mass = [tex]\frac{1}{2}mv_{c}^{2}[/tex]

Rotational K.E about the center of mass, [tex]\frac{1}{2}I\omega^{2}[/tex]

Potential energy about Center of Mass = [tex]mg\frac{L}{2}[/tex]

Now, applying the law of conservation at the lowest point of the rod:

[tex]\frac{1}{2}mv'_{c}^{2} + \frac{1}{2}I\omega'^{2} + 0 =\frac{1}{2}m(\frac{\omega' L}{2})^{2} + \frac{1}{2}I\omega'^{2}[/tex]

[tex]\frac{1}{2}mv'_{c}^{2} + \frac{1}{2}I\omega'^{2}  =\frac{1}{2}m(\frac{\omega' L}{2})^{2} + \frac{1}{2}\frac{mL^{12}}{12}\omega'^{2} = \frac{mL^{2}\omega'^{2}}{6}[/tex]

where

Moment of inertia about the center of mass at the lowest position is [tex]\frac{mL^{2}}{12}[/tex]

[tex]v'_{c} = \frac{\omega L}{2}[/tex]

Thus

From these, potential energy about center of mass = [tex]\frac{mL^{2}\omega'^{2}}{6}[/tex]

[tex]mg\frac{L}{2} = \frac{mL^{2}\omega'^{2}}{6}[/tex]

At the lowest point, [tex]\omega' = 7 rad/s[/tex]

Thus

[tex]mg\frac{L}{2} = \frac{mL^{2}\times 7^{2}}{6}[/tex]

[tex]g = \frac{49L}{3}[/tex]

g = 9.8[tex]m/s^{2}[/tex]

[tex]9.8 = \frac{49L}{3}[/tex]

L = 0.6 m

Answer:

speed of white ball is 1.13 m/s and speed of black ball is 2.78 m/s

initial kinetic energy = final kinetic energy

[tex]KE = 6.66 J[/tex]

Explanation:

Since there is no external force on the system of two balls so here total momentum of two balls initially must be equal to the total momentum of two balls after collision

So we will have

momentum conservation along x direction

[tex]m_1v_{1i} + m_2v_{2i} = m_1v_{1x} + m_2v_{2x}[/tex]

now plug in all values in it

[tex]1.47 \times 3.01 + 0 = 1.47 v_1cos68 + 1.47 v_2cos22[/tex]

so we have

[tex]3.01 = 0.375v_1 + 0.927v_2[/tex]

similarly in Y direction we have

[tex]m_1v_{1i} + m_2v_{2i} = m_1v_{1y} + m_2v_{2y}[/tex]

now plug in all values in it

[tex]0 + 0 = 1.47 v_1sin68 - 1.47 v_2sin22[/tex]

so we have

[tex]0 = 0.927v_1 - 0.375v_2[/tex]

[tex]v_2 = 2.47 v_1[/tex]

now from 1st equation we have

[tex]3.01 = 0.375 v_1 + 0.927(2.47 v_1)[/tex]

[tex]v_1 = 1.13 m/s[/tex]

[tex]v_2 = 2.78 m/s[/tex]

so speed of white ball is 1.13 m/s and speed of black ball is 2.78 m/s

Also we know that since this is an elastic collision so here kinetic energy is always conserved to

initial kinetic energy = final kinetic energy

[tex]KE = \frac{1}{2}(1.47)(3.01^2)[/tex]

[tex]KE = 6.66 J[/tex]

Answer:

4000 J

Explanation:

The energy possessed by virtue of motion of the body is called its kinetic energy.

When a body is in motion , it has kinetic energy.

Mass of the object, m = 80 kg

velocity of the object, v = 10 m/s

The formula for the kinetic energy is given by

[tex]K=\frac{1}{2}mv^{2}[/tex]

K = 0.5 x 80 x 10 x 10

K = 4000 J

Thus, the kinetic energy of the object is 4000 J.