A positive charge is moving towards south in a space where magnetic field is pointing in the north direction. The moving charge will experience :

Which one of the following astronomers proved that the Earth and other planets revolve around the Sun?

Sand falls vertically on a conveyor belt at a work rate of 0⋅1 kg/s. In order to keep the belt moving at a uniform speed of 2 m/s, the force required to be applied on the belt is :

The power required to lift a mass of 8⋅0 kg up a vertical distance of 4 m in 2 s is (taking acceleration due to gravity as 10 m/s²):