How much would a freefall weight need to weigh to generate 55psi

780relledge · « **on:** 09/04/2020 02:40:12 »

If you had a cylinder with a radius of 1.25ft and a length of 30ft and had a free falling piston, what would the piston need to weigh to compress the volume of air to 55psi?

syhprum · « **Reply #1 on:** 09/04/2020 07:24:51 »

Learn to do simple arithmetic !

780relledge · « **Reply #2 on:** 09/04/2020 07:26:30 »

Syhprum, I didn't come here to be insulted, came here to ask a question.

syhprum · « **Reply #3 on:** 09/04/2020 10:45:00 »

the question you ask is one of simple arithmetic such as a 10 year old might be expected to answer not one that needs to be discussed by a scientific forum.
If you lack the skill to solve it I suggest you get an arithmetic textbook

A-wal · « **Reply #4 on:** 09/04/2020 11:46:30 »

Quote from: 780relledge on 09/04/2020 02:40:12

If you had a cylinder with a radius of 1.25ft and a length of 30ft and had a free falling piston, what would the piston need to weigh to compress the volume of air to 55psi?

Quote from: syhprum on 09/04/2020 07:24:51

Learn to do simple arithmetic !

Quote from: syhprum on 09/04/2020 10:45:00

the question you ask is one of simple arithmetic such as a 10 year old might be expected to answer not one that needs to be discussed by a scientific forum.
If you lack the skill to solve it I suggest you get an arithmetic textbook

Why so damn rude?
The calculation might be simple but you need to know what it is.
No idea the btw Relledge, sorry.

Halc · « **Reply #5 on:** 09/04/2020 12:39:17 »

This has all the appearance of a homework question for which the OP made no effort to solve himself.

alancalverd · « **Reply #6 on:** 09/04/2020 12:45:51 »

Crap question. It all depends on the initial pressure.

Halc · « **Reply #7 on:** 09/04/2020 13:10:16 »

Quote from: alancalverd on 09/04/2020 12:45:51

Crap question. It all depends on the initial pressure.

Oh does it now? The problem actually gives more information than is needed.

Colin2B · « **Reply #8 on:** 09/04/2020 14:44:07 »

Quote from: Halc on 09/04/2020 12:39:17

This has all the appearance of a homework question for which the OP made no effort to solve himself.

I was about to ask the same.

alancalverd · « **Reply #9 on:** 09/04/2020 16:36:13 »

Quote from: Halc on 09/04/2020 13:10:16

Quote from: alancalverd on 09/04/2020 12:45:51
Crap question. It all depends on the initial pressure.
Oh does it now? The problem actually gives more information than is needed.

Yep, you are absolutely right! The "free falling" bit is offputting as it looks like a dynamic problem. That's an F for me!

Halc · « **Reply #10 on:** 09/04/2020 17:03:25 »

Quote from: alancalverd on 09/04/2020 16:36:13

The "free falling" bit is offputting as it looks like a dynamic problem. That's an F for me!

That wording threw me at first as well. If it is generating pressure, there is a force acting on it. If there is a force (other than gravity) acting on it, it isn't freefalling. If it's freefalling, it cannot weigh anything. More of an F for whoever worded the problem that way, but it seemed to provide extra information as an exercise to glean what parts are actually relevant.

Interestingly, the problem yields the same answer in other environments like the moon.

Bored chemist · « **Reply #11 on:** 09/04/2020 18:24:42 »

Ironically, you have now discussed it enough to invalidate the idea that it's too simple to discuss.
Perhaps someone should answer it.

Outcast · « **Reply #12 on:** 09/04/2020 18:46:50 »

Quote from: 780relledge on 09/04/2020 07:26:30

Syhprum, I didn't come here to be insulted, came here to ask a question.

Read some other threads....ya come to the wrong place...

syhprum · « **Reply #13 on:** 09/04/2020 20:01:49 »

I hope everyone resists the temptation to give an answer

Bored chemist · « **Reply #14 on:** 09/04/2020 20:09:53 »

Am I allowed to give an answer like " quite a big truck".

jeffreyH · « **Reply #15 on:** 09/04/2020 20:37:55 »

Quote from: 780relledge on 09/04/2020 02:40:12

If you had a cylinder with a radius of 1.25ft and a length of 30ft and had a free falling piston, what would the piston need to weigh to compress the volume of air to 55psi?

Don't you mean how much mass should the piston have? I tell you what, why don't you free fall down the cylinder with the piston and a scale in your hand. Then you can weigh it yourself. It might not be worth taking a packed lunch for such a short journey.

Petrochemicals · « **Reply #16 on:** 09/04/2020 23:12:57 »

Quote from: 780relledge on 09/04/2020 02:40:12

If you had a cylinder with a radius of 1.25ft and a length of 30ft and had a free falling piston, what would the piston need to weigh to compress the volume of air to 55psi?

Freefalling, is this in a vacuum or does it have an atmosphere around it ? The space created by the piston as it falls would create suction I believe.

Petrochemicals · « **Reply #17 on:** 09/04/2020 23:21:07 »

Are we counting gravitational rebound too, as in air springs ?

jeffreyH · « **Reply #18 on:** 10/04/2020 06:59:30 »

Quote from: Petrochemicals on 09/04/2020 23:12:57

Quote from: 780relledge on 09/04/2020 02:40:12
If you had a cylinder with a radius of 1.25ft and a length of 30ft and had a free falling piston, what would the piston need to weigh to compress the volume of air to 55psi?
Freefalling, is this in a vacuum or does it have an atmosphere around it ? The space created by the piston as it falls would create suction I believe.

Didn't you read the actual question? You quoted it.

alancalverd · « **Reply #19 on:** 10/04/2020 11:06:27 »

Quote from: jeffreyH on 09/04/2020 20:37:55

Don't you mean how much mass should the piston have?

I hope he doesn't, because there's no given value for g.

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How much would a freefall weight need to weigh to generate 55psi

780relledge (OP)

780relledge (OP)

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