Category: Work And Energy

A. frictional force
B. gravitational force
C. elastic force
D. centripetal force

A. man does more work than child
B. child does more work than man
C. both do the same amount of work
D. it is a foolish question

A. 4.2 km S-1
B. 7.5 km S-1
C. 9.5 km S-1
D. 1.1 km S-1

A. any rate
B. at variable rate
C. at uniform rate
D. at high rate

A. direct combustion
B. fermentation
C. both A and B
D. none of these

A. no formula
B. a formula mgh only
C. a formula
D. no general formula

A. non-conservative force
B. conservative force
C. both A and B
D. none of these

A. decay of radioactive element in the earth
B. compression of material in the earth
C. residual lost of the earth
D. all as said in A – B and C

A. torque
B. angular momentum
C. linear momentum
D. power

A. always positive
B. always negative
C. positive only for small frictional force
D. positive only for large frictional force