21.Impulse can be obtained from a

22.A quantity measured in the C.G.S system of units has dimensions M"2L3 T3/2. What numerical factor would be required to convert the quantity to SI units ?

23.A rope is wrapped twice around a rough pole with a coefficient of friction 'A . It is subjected to a force F1 at one end and a gradually increasing force F2 is applied at the other end till the rope just starts slip-ping. At this instant the ratio of F2 to Fi is

24.One Newton is equivalent to

25.The potential energy of a particle falling through a straight shaft drilled through the earth (assumed homogenous and spherical) is proportional to