Two mating spur gears have 40 and 120 teeth respectively. The pinion transmits a torque of 20 Nm rotating at 1200 rpm. The Torque transmitted by the gear is

28) A metallic body floats at the interface of mercury (of specific gravity 13.6) and water such that 40% of its volume is in Mercury and 60% in water. Total buoyant force ( in kN) experienced by body is (V=Volume of the floating body, g=10 m/square second)

29) The magnitude of the resultant of two equal coplanar forces acting at a point is equal to either of the forces. What is the angle between the forces?

30) A steel ball of mass 2.4 kg is tied to a string and whirled it in a horizontal plane in a circle of diameter 2 m at a constant speed of 20 rpm. The tension in the string is (ignore gravity)

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?