Which wave, a or b, has lower energy?

a, because it has a higher amplitude
b, because it has a higher amplitude
a, because it has a lower amplitude
b, because it has a lower amplitude

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

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?

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.