Question

What is the work done by centripetal force in moving a body through half cycle on circular path of radius 35 cm

Answer 1

The work done by a centripetal force in moving a body on the circumference of the circle is always zero. we know that work done by a force is given as

W = F d Cosθ

where  F = force , d = displacement , θ = angle between force and displacement

in case of work done by the centripetal force , the force is towards the center along the radius and the displacement vector is along the tangent to the circle . we know that the angle between the radius and tangent is always 90. hence the angle between centripetal force and displacement is 90

since Cos90 = 0

hence W = 0             in case of centripetal force

Answer 2

Answer:work=diameter ×force

Explanation:this is because the shortest path is through the diameter.