region of the cylinder 20 outward a distance of ure of the helium imme did you make? (b) Ha n? (Note that you nee

Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter11: Calibrating Instruments
Section: Chapter Questions
Problem 4RQ: Temperature-measuring instruments may be designed to measure the temperature of vapors, ________,...
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..P15 A horizontal cylinder 10 cm in diameter contains helium
gas at room temperature and atmospheric pressure. A piston
keeps the gas inside a region of the cylinder 20 cm long. (a) If you
quickly pull the piston outward a distance of 12 cm, what is the
approximate temperature of the helium immediately afterward?
What approximations did you make? (b) How much work did
you do, including sign? (Note that you need to consider the
outside air as well as the inside helium in calculating the amount
of work you do.) (c) Immediately after the pull, what force must
you exert on the piston to hold it in position (with the helium
enclosed in a volume that is 20 + 12 = 32 cm long)? (d) You
wait while the helium slowly returns to room temperature,
maintaining the piston at its current location. After this wait,
what force must you exert to hold the piston in position?
(e) Next, you very slowly allow the piston to move back into
the cylinder, stopping when the region of helium gas is 25 cm
long. What force must you exert to hold the piston at this
position? What approximations did you make?
Transcribed Image Text:..P15 A horizontal cylinder 10 cm in diameter contains helium gas at room temperature and atmospheric pressure. A piston keeps the gas inside a region of the cylinder 20 cm long. (a) If you quickly pull the piston outward a distance of 12 cm, what is the approximate temperature of the helium immediately afterward? What approximations did you make? (b) How much work did you do, including sign? (Note that you need to consider the outside air as well as the inside helium in calculating the amount of work you do.) (c) Immediately after the pull, what force must you exert on the piston to hold it in position (with the helium enclosed in a volume that is 20 + 12 = 32 cm long)? (d) You wait while the helium slowly returns to room temperature, maintaining the piston at its current location. After this wait, what force must you exert to hold the piston in position? (e) Next, you very slowly allow the piston to move back into the cylinder, stopping when the region of helium gas is 25 cm long. What force must you exert to hold the piston at this position? What approximations did you make?
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