Most Important Selected Qs for JEE AdvancedPhysicsWork, Power and Energy
A body of mass m is moving along a circular path of radius R such that its kinetic energy at any instant is k=k₀ ( t t₀ )^2 where t₀ is an appropriate constant. Then
Options
- AThe magnitude of tangential component of force acting on it must be constant.
- BThe magnitude of centripetal force acting on the body will be directly proportional of t ^2 .
- CAfter a long time, the resultant force will make a very small angle with the radius.
- DThe magnitude of centripetal force acting on the body will be directly proportional to t.
Correct answer
C. After a long time, the resultant force will make a very small angle with the radius.
Step-by-step solution
Use F_t=m d v d t and F_r= m v^2 r