What is the energy required to change 600g of liquid into steam if the specific heat latent is 4000 J/kg

Ametal ball with a mass of 0.028 kg is dropped from rest at a height of 1.0 meters above the ground. assuming the energy in the ball is conserved, how much kinetic energy will the ball have when it is 0.5 meters above the ground?

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c