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s344n2d4d5 [400]

3 years ago

13

What is the rule of electric charges? A. Opposite charges attract; like charges repel. B. How charges react is unpredictable. C.

Like charges attract; unlike charges push away. D. Charges that are the same will pull toward each other.

1 answer:

olya-2409 [2.1K]3 years ago

7 0

The answer is A. Opposite charges attract; like charges repel.

hope this helps, pls mark me Brainliest

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3 years ago

A solid sphere rolls along a horizontal, smooth surface at a constant linear speed without slipping. What is the ratio between t

dsp73

Answer:

option E

Explanation:

given,

Rotational Kinetic Energy, KE_r = $\dfrac{1}{2}I\omega^2$

Moment of inertia of the solid,

$I = \dfrac{2}{5}MR^2$

$\omega = \dfrac{V}{R}$

now,

$KE_r = \dfrac{1}{2}I\omega^2$

$KE_r = \dfrac{1}{2}\times \dfrac{2}{5}MR^2 (\dfrac{V}{R})^2$

$KE_r =\dfrac{1}{5}MV^2$ ......(1)

transnational kinetic energy

$KE_t =\dfrac{1}{2}MV^2$

Total kinetic energy

$KE = \dfrac{1}{2}MV^2 + \dfrac{1}{5} MV^2$

$KE = \dfrac{7}{10}MV^2$

ratio of rotational kinetic energy to the total kinetic energy

$\dfrac{KE_r}{KE_t}=\dfrac{\dfrac{1}{5}MV^2}{\dfrac{7}{10}MV^2}$

$\dfrac{KE_r}{KE_t}=\dfrac{2}{7}$

hence, the correct answer is option E

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3 years ago