Answer to Question #26162 in Mechanics | Relativity for fatma
A = F*d*cos(θ)
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
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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