7. If the specific latent heat ofice is 340 000 J/kg and the specific latent heat of steam is
2 300 000 J/kg, calculate
a) the energy needed to melt 2 kg ofice at 04
b) the energy needed to melt 500 g of ice al
0 °C
c) the energy needed to boil 3 kg of water a
100 °C
d) the energy needed to boil 100 g of water a
100 °C.

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

Sound is a disturbance that travels through a medium as a