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maria [59]
2 years ago
15

A CAR ACCElerates FROM REST To

Physics
1 answer:
Ilia_Sergeevich [38]2 years ago
5 0

Answer:

<u>666.6 kW</u>

Explanation:

<u>Power Formula</u>

  • Power = Force × Velocity

<u>Calculating Force</u>

  • F = ma
  • F = m(v - u / t) [From the equation v = u + at]
  • F = 2,000 (50/7.5)
  • F = 2,000 (20/3)
  • F = 40,000/3
  • F = 13333.3 N

<u>Solving for Power</u>

  • P = 13333.3 × 50
  • P = 666666.6 W
  • P = <u>666.6 kW</u>
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The perceived pitch of a tone is largely determined by its frequency

<h3>What is  frequency ?</h3>

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2 years ago
For a demonstration, a professor uses a razor blade to cut a thin slit in a piece of aluminum foil. When she shines a laser poin
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a=0.0947mm

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3 years ago
. A block of mass 4.0 kg on a spring has displacement as a function of time given by, x (t) = (1.0 cm) cos [(2.0 rad/s) t + 0.25
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Answer and Explanation:

1. Evaluate the function x(t) at t=0.5

x(t)=1cos(2t+0.25)\\x(0.5)=cos(2*0.5+0.25)=cos(1+0.25)=cos(1.25)=0.3153223624\approx0.31cm

2. The period of motion T can be calculated as:

T=\frac{2\pi}{\omega}

Where:

\omega=2rad/s

So:

T=\frac{2\pi}{2}=\pi\approx3.14s

3. The angular frequency can be expressed as:

\omega=\sqrt{\frac{k}{m} }

Solving for k:

k=(\omega)^2*m=(2)^2*4=4*4=16\frac{N}{m}

4. Find the derivate of x(t):

\frac{dx}{dt} =v(t)=-2sin(2t+0.25)

Now, the sine function reach its maximum value at π/2 so:

2t+025=\frac{\pi}{2}

Solving for t:

t=\frac{\frac{\pi}{2} -0.25}{2} =0.6603981634s

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t=\frac{2\pi-0.25}{2} =3.016592654s

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F=16*0.01=0.16N

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