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Q. Helium (He), a monatomic gas, fills a 0.035 m3 container. The pressure of the gas is 7.7 × 105 Pa. How long would a 0.25 hp engine have to run (1 hp = 746 W) to create an amount of energy equal to the internal energy of this gas?

Q. A loudspeaker of mass 18.00 {rm kg} is suspended a distance of h = 1.20 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 2.70 {rm m}. What is the tension T in each of the cables? Make use of 9.80 {rm m/s}^2 for the magnitude of the acceleration due to gravity?

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