Welcome to your Work ,Energy and Power
1.
A spring compressed x does work:
2.
Superconductors have resistivity…
3.
A spring of constant k is compressed by x. Stored energy is:
4.
Internal resistance of an ideal battery is…
5.
When temperature increases, resistance of metals…
6.
A particle moves in a circle at constant speed. Work done by centripetal force is:
7.
A block falls freely from height h. Its speed at half the height is:
8.
In parallel combination, voltage across each resistor is…
9.
Two springs k and 2k stretched equally. Ratio of energies:
10.
If cross-section area of wire is doubled, drift velocity…
11.
A block slides down a smooth incline of height h. What is its speed at the bottom?
12.
Potential energy of mass at height 2h:
13.
A body of mass m is thrown vertically upward with speed v. Maximum height reached is:
14.
Work-energy theorem states:
15.
Area under F–x graph represents:
16.
Work done by variable force F = ax²:
17.
A force does zero work if angle with displacement is:
18.
Current through a conductor depends on…
19.
Orbital speed in circular orbit is:
20.
A force F acts at angle θ with displacement s. Work done is:
22.
A block of mass m moves with speed v on a rough surface. Work done by friction is:
23.
Heating effect depends on…
25.
Power delivered by a force F on velocity v is:
26.
If current doubles, drift velocity…
27.
A car of mass m is stopped by brakes over distance d. Work done by brakes:
28.
Minimum energy to escape earth:
29.
Resistance of a wire becomes four times if…
30.
A force F produces power P at speed v. F equals:
31.
Electric current is defined as…
33.
Resistivity depends on…
34.
Power dissipation is maximum when…
35.
A block is lifted at constant speed. Net work is:
36.
Work done by gravity on satellite:
37.
A body of mass m moves with velocity 3v. Its KE becomes:
38.
A spring is stretched to 2x. Energy becomes:
39.
A body moves under force F = kx. Work done from 0 to x is:
40.
Drift velocity increases when…
41.
A ball hits wall elastically. Work done by wall is:
42.
A man does work W in time t. His power is:
43.
Value of g at depth R/2 is:
44.
Work done by conservative force around closed loop is:
45.
Current through a resistor is halved when…
