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Unformatted text preview: b. If it takes 6 hours to charge a completely dead laptop battery and energy costs $0.13 per kilowatt-hour, what is the cost of recharging the battery a hundred times? (4 pts) 4. A gas is confined in a horizontal piston-cylinder device with a diameter of 0.47 m. Heat is applied to the piston-cylinder and causes the piston to expand by 0.83 meters. Assume atmospheric pressure is 101 kPa. a. How much work is done by the gas when it expands? (4 pts) b. How much heat was applied to the piston-cylinder? (3 pts) c. What is the speed of the piston just before it reaches equilibrium? The mass of the piston is 50 kg. (4 pts)...
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- Spring '11