31) A 10 kg Aluminium block is dragged on a plain horizontal surface at a constant velocity of 2 m/s. A frictional force of 60 N acts on it. What is the net force acting on the block?

32) A crane lifts a mass of 200 kg from rest and it attains an upward velocity of 3 m/s in 2 s uniformly. The tension in the supporting cable is

33) Two bodies m1 and m2 (m1>m2) have the same kinetic energy. Then their momentum p1 and p2 satisfy

34) The Earth, Jupiter, Saturn and Uranus all revolve around the Sun. The Earth takes 1 year, Jupiter takes 12 years, Saturn takes 30 years and Uranus takes 84 years to complete one revolution around the Sun. At what periodicity, all these four planets lineup

35) Maximum power transmission in a belt is met when the total tension in the belt equals