JEE Main 2015 Physics question
A particle is moving in a circle of radius under the action of a force which is directed towards centre of the circle. Total mechanical energy (kinetic energy + potential energy) of the particle is (take potential energy for ):
Answer: (1)
Solution
For the circular orbit the force supplies the centripetal acceleration: , so and the kinetic energy is . The potential energy follows from with the attractive force of magnitude pointing inwards, so
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