Work & Energy — Set 7
Physics · कार्य और ऊर्जा · Questions 61–70 of 70
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1
If force and displacement are in opposite directions, the work done by the force is?
2
A block is pulled by 30 N over 5 m while friction of 10 N opposes motion. What is the net work done?
3
The CGS unit of energy is?
4
What is the change in gravitational potential energy of a 1 kg mass moved from 2 m to 5 m height? (Take g = 10 m/s^2)?
5
Work done in stretching a spring from extension x1 to x2 is?
6
Power in terms of work W done in time t is?
7
A 2 kW heater runs for 30 minutes. What energy is used in kWh?
8
When friction acts on a moving system, mechanical energy usually decreases because it is converted into?
9
The SI unit of work is?
10
Kinetic energy of an object depends on its?