80) A cable loaded with 10 kN/m of span is stretched between supports in the same horizontal line 100 m apart. If the central dip is 10 m, then the maximum and minimum pull in the cable respectively are

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