MASTERING PHYSICS PHY132 HW 17-1

MASTERING PHYSICS PHY132 HW 17-1 - HW17.1 Due: 11:00pm on...

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Unformatted text preview: HW17.1 Due: 11:00pm on Monday, October 18, 2010 Note: To understand how points are awarded, read your instructor's Grading Policy . [ Switch to Standard Assignment View] Pressure Cooker A pressure cooker is a pot whose lid can be tightly sealed to prevent gas from entering or escaping. Part A If an otherwise empty pressure cooker is filled with air of room temperature and then placed on a hot stove, what would be the magnitude of the net force on the lid when the air inside the cooker had been heated to ? Assume that the temperature of the air outside the pressure cooker is (room temperature) and that the area of the pressure cooker lid is . Take atmospheric pressure to be . Treat the air, both inside and outside the pressure cooker, as an ideal gas obeying . Hint A.1 Calculate the pressure inside Hint not displayed Hint A.2 Relating pressure and force Hint not displayed Hint A.3 Determine the role of the outside pressure Hint not displayed Express the force in terms of given variables. ANSWER: = Correct Part B The pressure relief valve on the lid is now opened, allowing hot air to escape until the pressure inside the cooker becomes equal to the outside pressure . The pot is then sealed again and removed from the stove. Assume that when the cooker is removed from the stove, the air inside it is still at . What is the magnitude of the net force on the lid when the air inside the cooker has cooled back down to ? Hint B.1 How to approach the problem Hint not displayed Hint B.2 What stays constant when the cooker is opened? [ Print ] Hint not displayed Hint B.3 Calculate the pressure inside Hint not displayed Express the magnitude of the net force in terms of given variables. ANSWER: = Correct Problem 16.26 A 20--diameter vertical cylinder is sealed at the top by a frictionless 16 piston. The piston is 88 above the bottom when the gas temperature is 311 . The air above the piston is at 1.00 pressure. Part A What is the gas pressure inside the cylinder? Express your answer using four significant figures. ANSWER: = 1.063 10 5 Correct Part B What will the pressure be if the temperature is lowered to 20 ? Express your answer using four significant figures. ANSWER: = 1.063 10 5 Correct Part C What will the height of the piston be if the temperature is lowered to 20 ? Express your answer using two significant figures. ANSWER: = 44 Correct Problem 16.31 7.70 10 3 Hint not displayed Hint B.3 Calculate the pressure inside Hint not displayed Express the magnitude of the net force in terms of given variables. ANSWER: = Correct Problem 16.26 A 20--diameter vertical cylinder is sealed at the top by a frictionless 16 piston. The piston is 88 above the bottom when the gas temperature is 311 . The air above the piston is at 1.00 pressure....
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This note was uploaded on 10/25/2010 for the course PHY 132 taught by Professor Rainey during the Fall '07 term at Cal Poly Pomona.

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MASTERING PHYSICS PHY132 HW 17-1 - HW17.1 Due: 11:00pm on...

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