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course Phy 242
January 28 around 12:40pm.
Continued of QA 1-19Answer the following:
If the sealed bottle is squeezed with the tube uncapped:
Which of the quantities P, V, N, n, T increase?
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None
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Which of the quantities P, V, N, n, T decreases?
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N, n, V (when squeezed, you’re pushing air OUT)
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Which of the quantities P, V, N, n, T remain unchanged?
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P (the bottle remains open to the atmosphere so the pressure at the end is the same at the beginning), T (besides the temp change in my hand, there’s none)
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List the quantities that change, and give a rough estimate of the percent change in each when you squeezed. A positive percent means the quantity increased, a negative percent means the quantity decreaseed.
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-N, -n, -V
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If the sealed bottle is squeezed with the tube capped:
Which of the quantities P, V, N, n, T increase?
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P, N, n (squeezing raises the pressure which decreases volume, which increases the collisions of molecules)
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Which of the quantities P, V, N, n, T decrease?
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V
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Which of the quantities P, V, N, n, T remain unchanged?
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T (same as above, besides the temp in my hand, there is no change)
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List the quantities that change, and give a rough estimate of the percent change in each when you squeezed. A positive percent means the quantity increased, a negative percent means the quantity decreased.
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+P, +N, +n, -V
@& In the sealed bottle, N and n would not change.*@
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If the temperature of the gas remains constant, the average speed of the molecules bouncing around inside the bottle also remains constant.
If this is the case, and the volume decreases, do the individual molecules strike the walls of the container harder, do they strike more frequently, or both? Explain
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Both, decreasing the volume of the air column, causes more frequent collisions between the air in the column and the water column (as well as the sides and end of the tube), resulting in more force on the end of the water column.
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@& You say they hit more frequently, and you draw the correct conclusion about the force.
However the individual collisions are no harder than before. Just a greater number in a given time interval.
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Good work. See my notes.
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