watchthesky30
New member
- Joined
- Sep 15, 2009
- Messages
- 19
Hi. I just want to see if I did this question correctly.
The question is:
how many revolutions will a car wheel of diameter 30 in. make as the car travels a distance of one mile?
This is what i got for the answer:
= mile = 5280 ft = 63360 inches
The wheel's circumference is 30*pi inches, so it goes that far each revolution.
63360 in/(30*pi) in/rev = 2112/pi revolutions
= ~ 672.27 revolutions
60 mph is 1 mile per minute, so the wheel would turn at 672 rpm at 60 mph.
The question is:
how many revolutions will a car wheel of diameter 30 in. make as the car travels a distance of one mile?
This is what i got for the answer:
= mile = 5280 ft = 63360 inches
The wheel's circumference is 30*pi inches, so it goes that far each revolution.
63360 in/(30*pi) in/rev = 2112/pi revolutions
= ~ 672.27 revolutions
60 mph is 1 mile per minute, so the wheel would turn at 672 rpm at 60 mph.