81) Minimum pull in a suspended cable with supports at two ends is equal to

82) A light rope is loaded with many equal weights at equal horizontal intervals. The points of suspension on the rope lie on a

83) The maximum pull in a cable, carrying a uniformly distributed load and supported at two ends which are at the same level, is at

84) A ball moving on a smooth horizontal table hits a rough vertical wall, the coefficient of restitution between ball and wall being 1/3. The ball rebounds at the same angle. The fraction of its kinetic energy lost is

85) A particle is dropped from a height of 3 m on a horizontal floor, which has a coefficient of restitution with the ball of 1/2. The height to which the ball will rebound after striking the floor is