1 hp is equal to
0.746 kW
7.46 kW
74.6 kW
746 kW
When a body starts falling its :
Kinetic energy changes to potential energy
No change taken place
Energy becomes zero
Potential energy changes to kinetic energy
Kgm2 s-2 represents the unit of
Kinetic energy
Work done
Potential energy
All the above
What is the momentum of a body of mass 100 g, having a K.E.of 20 J ?
2 kg ms-1
1/2 kg ms-1
2 g cm s-1
.2 kg cm s-1
The force applied and displacement of the body are inclined at 900with each other, calculate the work done ?
Infinite
Maximum
Zero
Unity
A force of 7N acts on an object. The displacement is 8m in the direction of force. What is the work done?
24 J
56 J
54 J
64 J
A boy of mass 50 kg runs up staircase of 45 steps in 9 s. If the height of each step is 15 cm, find his power. Take g = 10ms-1
400 W
275 W
375 W
575 W
The moon revolves around the earth exerts a radial force on the moon. Does the earth perform work on the moon?
No
Yes, some times
Yes, always
Cannot be decided
Which of the following graphs closely represents the kinetic energy (k) of a freely falling body and its height (h) above the ground?
Which of the following graphs best represents the total energy (T) of a freely falling body and its height (h) above the ground?
