Tank of pressurized air to loosen bolts

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Homework Help Overview

The problem involves a tank of pressurized air used to operate a bolt wrench, with specific conditions regarding the tank's volume, pressure, and temperature. The context is related to thermodynamics and gas laws, particularly in understanding how changes in temperature and pressure affect the usability of the air supply.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss the application of the ideal gas law and the implications of changing temperature on pressure and volume. There is an attempt to calculate the change in pressure but concerns are raised about missing information regarding the number of moles.

Discussion Status

The discussion is ongoing, with participants exploring the relationship between pressure, volume, and temperature. Some guidance has been offered regarding the use of the ideal gas law, but there is no consensus on how to proceed due to the missing variable.

Contextual Notes

Participants note the lack of information regarding the number of moles of gas, which is critical for applying the ideal gas law effectively. The problem is framed within the constraints of a university entrance exam, which may influence the expectations for problem-solving approaches.

yassine
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Car mechanics use compressed air tools to open bolts. Instead of using an air compressor one can also use a tank of pressurized air. There is an air tank with a volume of 50 L to work with. The pressure of the tank is 50 bars when it is stored indoors at 20 °C. The bolt wrench needs at least 10 bar pressure to operate. How long can the mechanics use the bolt wrench outdoors at -20 °C if it consumes 200 L/min of air at normal pressure? The normal pressure is 1.0 bar
 
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i haven't tried anything yet i found this on a entrance exam to a university and I've been stuck on it for a while
 
yassine said:
i haven't tried anything yet i found this on a entrance exam to a university and I've been stuck on it for a while
What part are you stuck on? You must show some effort.
 
Greg Bernhardt said:
What part are you stuck on? You must show some effort.

i tried to use P(delta)V=nR(delta)T to calculate the change in pressure but since the problem lacks on n i can't do that
 
yassine said:
i tried to use P(delta)V=nR(delta)T to calculate the change in pressure but since the problem lacks on n i can't do that
You know the volume of the tank, the initial temperature, and the initial pressure. From the ideal gas law, what is the initial number of moles n?

Chet
 

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