14. How long will it take for the boat to cross the river? a. 145 seconds
b. 1.4 seconds
c. 250 seconds
d. 179 seconds
5

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?

Convection currents are caused by differences in what two things?

Which radioisotope is used in dating geological formations?