Circular Motion

moving along the circumference of a circle completes two revolutions. If the radius of the circular path is R, the ratio of displacement to the covered path will be

A.??R B.2??R C.zero D.4??R

Centripetal force performs

A.maximum work B.minimum work C.negative work D.no work

A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent weight of the man is

A.mg B.mg – ma C.mg + ma D.mg – ma

When a body moves in a circle of radius r with linear speed V its centripetal force is

A.mV/r2 B.mV/r C.mV2/r D.mV2/r2

Who discovered the inverse square law for gravity?

A.Einstein B.Galileo C.Newtons D.Plank

A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position the tension in the string is

A.maximum B.zero C.equal to the weight of the stone D.less than the weight of the stone

The span of broad jump depends upon

A.mass of the jumper B.height of jump C.angle of projection D.none

A.4 B.3 C.2 D.5