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Unformatted text preview: down the string? (d) Planet X has 4 times the earth’s mass and orbits the sun every 27 years. What is the radius of its orbit in AU, where 1 AU is the earthsun distance? Problem 2 (a) 1500 J of heat flows out of gas as it is compressed from point A to point B in the PVdiagram as shown. What is the change in the internal energy of the gas? (b) An astronaut stands on the surface of a spherical asteroid with a 400 m radius and a 5 × 10 12 kg mass. What is the gravitational acceleration on the surface and with what speed must he jump to fully escape the gravity of the asteroid? Problem 3 (a) A heat engine takes 2300 J of heat from a boiling water and vents 2000 J of heat to the environment at 20 ° C. What is the efficiency of this heat engine? (b) What is the maximum efficiency of the heat engine in part (a)?...
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This document was uploaded on 02/01/2010.
 Spring '09

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