76) If a body is lying on a plane whose inclination with the horizontal is less than the angle of friction, then i) a force is required to move the body upwards ii) a force is required to move the body downward iii) the body will not be in equilibrium The correct answer is

77) Intrinisic equation of catenary is given by[where C is some constant.]

78) The shape of a suspended cable for a uniformly distributed load over it is

79) Cartesian form of the equation of catenary is

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