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4 years ago

7

How much work is required to move

1 answer:

Nikitich [7]4 years ago

6 0

The work is path independent since we have a conservative force.

Thus $W=d\cdot\frac{q\cdot U}{d^2}=\frac{3.0\cdot9.0}{0.010}=\boxed{2700 J}$

Answer (1)

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4 years ago

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3 years ago

What is the frequency of a wave that has a wavelength of 0.39 m and a speed

gogolik [260]

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<h3>The answer is option B</h3>

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Hope this helps you

7 0

4 years ago

A rotating wheel requires 3.05-s to rotate through 37.0 revolutions. Its angular speed at the end of the 3.05-s interval is 97.9

Setler79 [48]

Answer:

$\alpha=14.2rad/s^2$

Explanation:

The formula that relates angular displacement with angular acceleration is:

$\Delta \theta=\omega_i t+\frac{\alpha t^2}{2}$

We can obtain $\omega_i$ from the definition of angular acceleration:

$\alpha=\frac{\Delta \omega}{\Delta t}=\frac{\omega_f-\omega_i}{t}$

$\omega_i=\omega_f-\alpha t$

Putting all together:

$\Delta \theta=(\omega_f-\alpha t) t+\frac{\alpha t^2}{2}=\omega_f t-\frac{\alpha t^2}{2}$

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$\alpha=\frac{2(\omega_f t-\Delta \theta)}{t^2}$

And for our values is:

$\alpha=\frac{2((97.9rad/s)(3.05s)-(37(2\pi rad)))}{(3.05s)^2}=14.2rad/s^2$

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4 years ago