One Joule per second is equal to

55) The motion of an artificial satellite orbitting the Earth at constant height is an example of

56) What is the weight of a women standing inside a lift which is moving down with an acceleration of 9.8 m/ square second ?

57) The force which acts along the radius of a circle and directed towards its centre is known as

58) The quantum of force that produces an acceleration of 1 m/ square second on a mass of one kg, in the direction of which it acts is equal to