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Can you give me a physics question that involves ratios ?

iMeep

can you give me a simple physics Question that involves ratios please.

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Reply 1

lerjj

Original post by iMeep

can you give me a simple physics Question that involves ratios please.

Posted from TSR Mobile

Two otherwise identical cylinders of copper have diameters in the ration 1:3. What is the ratio of their resistances?

It might help to know that:

R\propto \dfrac{L}{A}

where R is resistance, L is length and A is cross sectional area.

Reply 2

iMeep

Original post by lerjj

Two otherwise identical cylinders of copper have diameters in the ration 1:3. What is the ratio of their resistances?

It might help to know that:

R\propto \dfrac{L}{A}

where R is resistance, L is length and A is cross sectional area.

Wow thanks lol
How would I work this out though? :tongue:

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Reply 3

lerjj

Original post by iMeep

Wow thanks lol
How would I work this out though? :tongue:

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If cylinder A has a diameter of d, and the diameters of cylinder A and B are in ratio 1:3, what is the diameter of cylinder B? Then, work out the cross-sectional areas for each of them and put that into the equation I gave above.

Reply 4

Stonebridge

Original post by iMeep

can you give me a simple physics Question that involves ratios please.

Posted from TSR Mobile

This is a rather vague question.
it would help if you specified a topic you have studied in physics so save us time with questions you don't understand.

For example.
What is the ratio of the pressure of a fixed volume of ideal gas at 200 deg C to its pressure at 100 deg C
The answer is not 2 to 1, by the way.