True or false Dogs contribute to mechanical weathering.

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?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter