Does the sun do any work on earth, when earth revolves around the sun in a perfectly circular orbit? Justify the answer.
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Expert's answer
2013-04-08T08:01:16-0400
for a constant force that is not directed along the line, followed by the particle work equals: A = F*d*cos(θ) where θ is the angle between the force vector and the direction of movement; F - magnitude of force d - distance In our case force and direction of motion is perpendicular, so θ=90 Therefore: cos(90)=0 => A=0 in each moments of time. Answer: the sun doesn't do any work on earth, when earth revolves around the sun in a perfectly circular orbit.
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