Raffacak3s
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How do I convert from radians per second to revolutions per minute?
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uberteknik
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(Original post by Dexter212)
How do I convert from radians per second to revolutions per minute?
2 steps:

First convert radians per second to revolutions per second

\textrm{r.p.s.} = \frac{\textrm{radians per second}}{2\pi}

Then convert revolutions per second to revolutions per minute:

\textrm{r.p.m} = \frac{\textrm{r.p.s}}{60}



Or in 1 step:

i.e. putting them both together the conversion is:

\textrm{r.p.m} = \frac{\textrm{radians per second}}{120\pi}
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Raffacak3s
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(Original post by uberteknik)
2 steps:

First convert radians per second to revolutions per second

\textrm{r.p.s.} = \frac{\textrm{radians per second}}{2\pi}

Then convert revolutions per second to revolutions per minute:

\textrm{r.p.m} = \frac{\textrm{r.p.s}}{60}



Or in 1 step:

i.e. putting them both together the conversion is:

\textrm{r.p.m} = \frac{\textrm{r.p.s}}{120\pi}
Thank you very much. Can you please help me in this question?

A car travels 10km, one wheel has a radius of 30cm, find the angle it spins when it travels the 10km.
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uberteknik
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(Original post by Dexter212)
Thank you very much. Can you please help me in this question?

A car travels 10km, one wheel has a radius of 30cm, find the angle it spins when it travels the 10km.
1) First find the circumference of the wheel. This gives us the distance the car travels when the wheel turns one revolution.

We need to be careful and keep all of the units the same. So make sure you convert 30cm to metres first.

2) Now find out how many circumferences (revolutions) there are in 10km. So again first convert km to metres: 1km = 1000 metres.

\textrm{revolutions} = \frac{\textrm{distance travelled (metres)}}{\textrm{circumference}}

3) Then finally convert revolutions to degrees.

i.e. 1 revolution = 360o

So the final answer is revolutions x 360o.
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Raffacak3s
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(Original post by uberteknik)
1) First find the circumference of the wheel. This gives us the distance the car travels when the wheel turns one revolution.

We need to be careful and keep all of the units the same. So make sure you convert 30cm to metres first.

2) Now find out how many circumferences (revolutions) there are in 10km. So again first convert km to metres: 1km = 1000 metres.

\textrm{revolutions} = \frac{\textrm{distance travelled (metres)}}{\textrm{circumference}}

3) Then finally convert revolutions to degrees.

i.e. 1 revolution = 360o

So the final answer is revolutions x 360o.
Thanks , This is basically what i did. I got 5305.164 revolutions. But Isaac Physics said it was wrong. BTW it asked for it in radians too. So i would assume i would have to leave my final answer as 5305?
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Eimmanuel
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(Original post by Dexter212)
Thanks , This is basically what i did. I got 5305.164 revolutions. But Isaac Physics said it was wrong. BTW it asked for it in radians too. So i would assume i would have to leave my final answer as 5305?
You may want to pay attention to the significant figures of your answer. Isaac Physics is very particular about s.f.
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uberteknik
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(Original post by Dexter212)
Thanks , This is basically what i did. I got 5305.164 revolutions. But Isaac Physics said it was wrong. BTW it asked for it in radians too. So i would assume i would have to leave my final answer as 5305?
Convert to radians first, multiply by 2 pi.

Careful with rounding.
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Raffacak3s
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(Original post by uberteknik)
Convert to radians first, multiply by 2 pi.

Careful with rounding.
Thnks got it
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ARMY101
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(Original post by raffacak3s)
thanks , this is basically what i did. I got 5305.164 revolutions. But isaac physics said it was wrong. Btw it asked for it in radians too. So i would assume i would have to leave my final answer as 5305?
final answer would be in radians so convert 5305 into radians and put to tsf which is 33000. This is three years late sorry.
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