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Given that the Earth's mass is $m,$ its tangential speed as it revolves around the Sun is $v$ , and the distance from the Sun to the Earth is $r,$ which of the following correctly describes the work done by the centripetal force, $W_{c}$ , in one year's time?(A) $\mathrm{W}_{\mathrm{c}}>2 r\left(m v^{2} / r\right)$(B) $\mathrm{W}_{\mathrm{c}}=2 r\left(m v^{2} / r\right)$(C) $\mathrm{W}_{\mathrm{c}}<2 r\left(\mathrm{mv}^{2} / r\right)$(D) Cannot be determined

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Chapter 12

Practice Test 2

Section 1

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Hi in uh uniform circular motion as a century pittle force, which is radial in nature in direction. So it acts always for perpendicular to the direction of motion. Because it is tangential, the direction of motion is in general. Hence we can say Work done by centripetal force is always zero Means WC is zero. Hands only correct. Option seems to be correct. Option is that this work done by the centripetal force is less than to our multiplied by century pittle force mv square by uh, because options say W. C. Is more than this. No, it cannot be because it is zero. Option B says W. C. Is equal to to work into this car buyer, which is not correct Because W 30. So as W zero. So we can say WC is less than two are into invisible by art and option B. C. S. We cannot little mind this work. No, that is also not correct. So here we can say option. See is correct. Thank you.

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