In the united states, most of our energy comes from this non-renewable resource, which has a negative effect on the environment: select one: a. coal b. nuclear c. natural gas d. petroleum i think it is a. coal but i am not sure

Asample of a gaseous substance changes into a liquid

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.