How many joules of heat would be required to heat 0.5 kg of aluminum by 2k? a) 300 j b) 450 j c) 900 j d) 1800 j

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

Ahot-air balloon is 11.0 m above the ground and rising at a speed of 7.00 m/s. a ball is thrown horizontally from the balloon basket at a speed of 9.00 m/s. ignore friction and air resistance and find the speed of the ball when it strikes the ground.

During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.