A 2 kW motor is used to pump water to a height of 10 m. Assuming 100% efficiency, what volume of water can it lift per second?

A stone of mass 1 kg is tied to a string 4 m long and is rotated at constant speed of 40 ${\rm{m}}{{\rm{s}}^{ - 1}}$ in a vertical circle. The ratio of the tension at the top and the bottom is

A weightless thread can bear tension upto 3.7 kg wt. A stone of mass 500 gms is tied to it and revolved in a circular path of radius 4 m in a vertical plane. If $g = 10\;m{s^{ - 2}}$ , then the maximum angular velocity of the stone will be

A pump lifts water from a well 40 m deep at a rate of 10 kg/s. If the pump operates at 75% efficiency, what is the power consumed by the pump? (g = $10 \ m/s^2$)

A body executing uniform circular motion has at any instant its velocity vector and acceleration vector

A body of mass 0.4 kg is whirled in a vertical circle making 2rev/s. If the radius of the circle is 2m, then tension in the string when the body is at the top of the circle is

The string of pendulum of length l is displaced through ${90^0}$ from the vertical and released. Then the minimum strength of the string in order to withstand the tension, as the pendulum passes through the mean position is

A1 kg stone at the end of 1 m long string is whirled in a vertical circle at constant speed of 4 m/sec. The tension in the string is 6 N, when the stone is at $(g = 10\;m/{\sec ^2}\;)$

A stone is whirled in a vertical plane. The stone generally has

A body of mass 2 kg is projected at 20 $m{s^{ - 1}}$ at an angle ${60^0}$ above the horizontal. Power on the block due to the gravitational force at its highest point is

Two motors, A and B, lift identical loads to the same height. Motor A does the work in half the time taken by motor B. Which motor has greater power?