# Physics AS SI Units Help

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Could someone tell me the answer to this question so I can double check my own since Google won't tell me?

Show that the following equation is homogeneous using units.

Force = mass x (speed)^2/radius

Show that the following equation is homogeneous using units.

Force = mass x (speed)^2/radius

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#2

(Original post by

Could someone tell me the answer to this question so I can double check my own since Google won't tell me?

**LLT05**)Could someone tell me the answer to this question so I can double check my own since Google won't tell me?

*help*, not provide solutions.

(Original post by

Show that the following equation is homogeneous

Force = mass x (speed)^2/radius

**LLT05**)Show that the following equation is homogeneous

**using units**.Force = mass x (speed)^2/radius

hint: look at the words in bold.

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(Original post by

No. Over here, people only

What have you done so far?

hint: look at the words in bold.

**0ptics**)No. Over here, people only

*help*, not provide solutions.What have you done so far?

hint: look at the words in bold.

RHS: mass = kg, speed = m/s^2, radius = ?

I think my answer is just kg m/s^2, making the equation homogeneous. But I'm confused about what I'm supposed to do with the radius?

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#4

(Original post by

LHS: Force = m kg/s^2

RHS: mass = kg, speed = m/s^2, radius = ?

I think my answer is just kg m/s^2, making the equation homogeneous. But I'm confused about what I'm supposed to do with the radius?

**LLT05**)LHS: Force = m kg/s^2

RHS: mass = kg, speed = m/s^2, radius = ?

I think my answer is just kg m/s^2, making the equation homogeneous. But I'm confused about what I'm supposed to do with the radius?

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(Original post by

Do you know the units for radius? Radius is a length. Btw, you might want to recheck your units for speed.

**0ptics**)Do you know the units for radius? Radius is a length. Btw, you might want to recheck your units for speed.

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**0ptics**)

Do you know the units for radius? Radius is a length. Btw, you might want to recheck your units for speed.

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#7

(Original post by

Is speed just m/s? I thought it would be squared since in the equation speed is squared

**LLT05**)Is speed just m/s? I thought it would be squared since in the equation speed is squared

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#8

(Original post by

Is the equation even homogeneous?

**LLT05**)Is the equation even homogeneous?

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(Original post by

It is. Why do you think otherwise?

**0ptics**)It is. Why do you think otherwise?

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#10

(Original post by

I was wondering how the equation could be homogeneous if force = m kg/s^2 and I have kg (mass) and m/s^2 (speed) then I thought that I have all I need for the equation so what is radius or why do I have to square the m as well. I think I get it now. Thanks

**LLT05**)I was wondering how the equation could be homogeneous if force = m kg/s^2 and I have kg (mass) and m/s^2 (speed) then I thought that I have all I need for the equation so what is radius or why do I have to square the m as well. I think I get it now. Thanks

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(Original post by

So I presume that you now know why you have to square the m in speed as well as knowing the units for radius. One more thing. The units for force is kg m/s^2, not m kg/s^2, big difference!

**0ptics**)So I presume that you now know why you have to square the m in speed as well as knowing the units for radius. One more thing. The units for force is kg m/s^2, not m kg/s^2, big difference!

Also if I had s = m / m/s^2, would the m cancel out leaving me with s = s^2, and would that equation be homogenous.

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