As you heat a piece of wood on a fire, the temperature of the wood increases. what does this tell you? a. the molecules in the wood are vibrating faster
b. the total thermal energy of the wood is decreasing
c. the chemical energy of the wood is increasing
d. the molecules in the wood are vibrating more slowly

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)