A 12kg box is sliding along a horizontal surface while experiencing a rightward applied force of +50 N and a leftward force of friction of -26 N. The box has a displacement of 20 meters.

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?

What are similarities and differences between refraction, reflection, diffraction and absorption?

What is the angular momentum of the bar about the axle?