. A mass of 5 kg is moving along a circular path of radius 1 m. If the mass moves with 300 revolutions per minute, its kinetic energy would be a) 250π2 b) 100 π2 c) 5 π2 d) 0
Correct option is A) Here, Mass, m=5 kg,Radius,R=1 m v=300 rpm=60300rps=5 rps The angular speed is given by ω=2πv=2π×5=10πrads−1 The linear speed is v=ωR=(10πs−1)(1 m)=10πms−1 Kinetic energy, K=21mv2 K=21×(5 kg)(10πms−1)2=250π2J.
