A small lump of ice (a hailstone) at falls 0°C to the Earth’s surface. When the hailstone hits?

the surface, all of the kinetic energy of the hailstone is transferred to thermal energy in the


ice. Calculate the minimum speed of the hailstone so that it just melts when it hits the


surface. The specific latent heat of fusion of ice is 340kJ kg−1 (power)


2) By reference to your answer in (a), suggest whether hailstones are likely to melt on hitting


the Earth’s surface.

A small lump of ice (a hailstone) at falls 0°C to the Earth’s surface. When the hailstone hits?
thermal energy needed for the melting = 340kJ kg-1 * mass of ice





kinetic energy provides all the thermal energy, so


0.5 * mass of ice * velocity of ice^2 = 340000 * mass of ice


velocity of ice ^2 =680000


velocity of ice = 825 m s-1





Hope it's correct. Haha..





Question 2.


Perhaps not. because there will be some energy transfered to sound energy, etc..