anonymous
  • anonymous
If a wheel with a radius of 80 inches spins at a rate of 50 revolutions per minute, find the approximate linear velocity in miles per hour/ Use 3.14 for pi. Thank you!
Mathematics
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anonymous
  • anonymous
If a wheel with a radius of 80 inches spins at a rate of 50 revolutions per minute, find the approximate linear velocity in miles per hour/ Use 3.14 for pi. Thank you!
Mathematics
chestercat
  • chestercat
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welshfella
  • welshfella
first work out the circumference of the wheel can you do that?
welshfella
  • welshfella
Circumference = 2 * 3.14 * radius
anonymous
  • anonymous
yes, 2pi r= 502.4

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welshfella
  • welshfella
= 2* 3.14 * 80 = ?
welshfella
  • welshfella
50 revolutions per minute = 50 * 502.4 ins per minute
anonymous
  • anonymous
that's how I get stuck! it's inches to miles and minutes to hours... I've tried it about 5 different ways before I posted. (It's multiple choice, so I know my answers are wrong when they aren't there!)
welshfella
  • welshfella
I'm not at my best today - i just said divide by 60 instead of multiply its 50*502.4 * 60 inches per hour then as there are 5280 * 12 inches ina mile mph = 50*502.4 * 60 ------------- 5280*12
welshfella
  • welshfella
= 23.79 mph ?
welshfella
  • welshfella
is that a choice?
anonymous
  • anonymous
ahhhh! Thanks found my error. I was forgetting the 50 back in the original formula. Early for me too, apparently.
welshfella
  • welshfella
lol ok

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