Chap#04 Work and Energy Flashcards
Two masses of 1g and 4g are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is:
1 : 2
A body moves a distance of 10m along a straight line under the action of a force of 5 Newtons. If the work done is 25 joules, the angle which the force takes with the direction of motion of the body is:
60°
A body of mass 2kg is thrown up vertically with K.E. of 490 joules. If the acceleration due to gravity is 9.8 m/s^2 , the height at which the K.E. of the body becomes half of its original value is given by:
12.5 m
Two bodies of masses m1 and m2 have equal momentum their kinetic energies E1 and E2 are in the ratio:
m2 : m1
Two bodies with masses Ma and Mb are moving with equal kinetic energy. Their linear momenta are numerically in a ratio:
√ Ma : √ Mb
How much water a pump of 2kW can raise in one minute to a height of 10m, take g = 10 m/S^2
1200 liters
A bullet is shot from a rifle. As a result the rile recoils. The kinetic energy of rifle as compared to that of bullet is:
Less
A man pushes a wall but fails to displace it. He does
No work
A particle moves along a circular path under the action of a force. The work done by the force is:
Zero
A 2kg body and a 3kg body have equal momentum. If the kinetic energy of 3 kg body is 10 J, the K.E. of 2 kg body will be:
15 J
