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Q. A spherical balloon of volume 4.03 x10^3 cm3 contains helium at a pressure of 1.15 105 Pa. How many moles of helium are in the balloon if the average kinetic energy of the helium atoms is 3.60 x10-22 J?

Q. Block B, with mass 5.00 kg, rests on block A, with mass 8.00 kg, which in turn is on a horizontal tabletop. There is no friction between block A and the tabletop, but the coefficient of static friction between block A and block B is 0.750. A light string attached to block A passes over a frictionless, mass-less pulley, and block C is suspended from the other end of the string.

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