Answer the following
If 3000 tons of water falls from 10 m high dam in one minute, then calculate the equivalent power if all its energy is utilised. (1 ton = 1000 kg)

500 kg water isstored in the overhead tank of a 10 m high building.Calculate the amount of potential energy stored in the water.

Answer the following questions : If density of water is 10^3 kg/m^3 and density of copper is 7.52 x 10^3 kg/m^3 , calculate relative density of copper .

Answer the following questions: Classify each of the following into kinetic energy, potential energy or kinetic energy and potential energy: (1) A compressed spring (2) The wound up spring of a watch (3) A raised hammer (4) A bullet released from a gun (5) A falling stone (6) The swinging pendulum of a clock (7) The explosive mixture in a bomb (8) wind (9) Water stored in a dam (10) A stretched bow string (11) Running water (12) waterfall.

Answer the following questions : Compare the gravitational force on a body of mass 1 kg due to the earth with the force on the same body due to another body of mass 1 kg at a distance of 1m from the first body. (Mass of the earth = 6xx10^24 kg, radius of the earth= 6400 km)

A flywheel used to prepare earthenware pots is set into rotation at 100 rpm. It is in the form of a disc of mass 10 kg and radius 0.4 m. A lump of clay (to be taken equivalent to a particle) of mass 1.6 kg falls on it and adheres to it at a certain distance X from the centre. Calculate X if the wheel now rotates at 80rpm.

A flywheel used a prepare earthenware pots is set into rotation at 100rpm. It is in the form of a disc of mass 10 kg and radius 0.4 m. A lump of clay (to be taken equivalent to a particle) of mass 1.6 kg falls on it and adheres to it at a certain distance x from the centre. Calculate x if the wheel now rotates at 80 rpm.

1.0 kg of liquid water is boiled at 100^@C and all of it is converted to steam. If the change of state takes place at the atmospheric pressure (1.01 xx 10^5 Pa ), calculate the change in the internal energy of the system. Given , the volume of water changes from 1.0 xx 10^-3 m^3 in liquid form to 1.671m^3 when in the form of steam.

A spring ball of mass 0.5 kg is dropped from some height. On falling freely for 10 s, it explodes into two fragments of mass ratio 1:2 . The lighter fragment continues to travel downwards with speed of 60 m//s . Calculate the kinetic energy supplied during explosion.

A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heal during its fall. The value of h is [Latent heat of ice is 3.4 xx 10^5 J/kg and g=10 N/kg ]