Work & Energy — Set 3
Physics · कार्य और ऊर्जा · Questions 21–30 of 70
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1
A 20 N force acts on a body and produces a displacement of 2 m at an angle of 60° to the force. What is the work done?
2
Kinetic energy is a?
3
In uniform circular motion with constant speed, the kinetic energy of the body is?
4
If a body has momentum p and mass m, its kinetic energy is?
5
A 0.5 kg ball moves with speed 4 m/s. What is its kinetic energy?
6
Work done by gravity when a body moves between two heights depends on?
7
Energy stored in a stretched or compressed spring is called?
8
If only conservative forces act on a system, its mechanical energy?
9
A machine takes 500 J input energy and gives 400 J useful output. What is its efficiency?
10
Power is defined as?