From what height must a hailstone at `0^(@)C` fall in order that it may melt on reaching the ground, assuming that 7% energy is lost during fal.

From what height must a block of ice be dropped in order that it may melt completely. It is assumed that the whole of energy is retained by ice. Given that latent heat of ice = 80 cal g^(-1) .

From what minimum height a block of ice has to be dropped in order that 0.5% of ice melts on hitting the ground ?

Hailstones fall from a certain height. If they melt completely on reaching the ground, find the height from which they fall.

A lead ball at 30^(@)C is dropped from a height h. The ball is heated due to the air resistance and it completely melts just before reaching the ground, The molten substance falls slowly on the ground. Latent heat of fusion of lead is 22200 Jk//g . Specific heat capacity of lead =126J//kg-^(@)C and melting point of lead =330^(@)C , Assume that all mechanical energy lost is used to heat the ball. Find the value of h in km ? ("Use" g=10 m//s2)

A block of ice at 0^@C is dropped from a height and melts completely on reaching the ground.assuming no loss of energy on the way to ground , Find the height from which it is dropped .

A lead ball at 30^@C is dropped from a height of 6.2km . The ball is heated due to the air resestance and it completely melts just before reaching the ground. The molten substance falls slowly on the ground. Calculate the latent heat of fusion of lead. Specific heat capacity of lead =126 J//Kg-^(@)C and the melting point of lead =330^@C . Assume that any mechanical energy lost is used to heat the ball.

From what height must a block of ice fall to just melt by the impact assuming that half of the heat generated is absorbed by ice? ( J=4.2 joules per calories and L=80 kilocalories per kg)

A hainmer of mass Mkg falls from a height h meter upon the top of an inelastic pile of mass m kg and drive it into the groung a sistance x meter. Find the resistance of the ground ehen it is assumed to be constant. Find also the time during which the lile is in motion and the kinetic energy lost at the impact.