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moongazer
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The speed of a car is 80 miles per hour. Find the radius of the car wheels in inches if the car makes 300 rev/min.
 one year ago
 one year ago
moongazer Group Title
The speed of a car is 80 miles per hour. Find the radius of the car wheels in inches if the car makes 300 rev/min.
 one year ago
 one year ago

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moongazer Group TitleBest ResponseYou've already chosen the best response.1
I got r=44.82 inches is it correct?
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
how many revolutions per hour does it make?
 one year ago

moongazer Group TitleBest ResponseYou've already chosen the best response.1
5 rev per hour
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
really? it does 300 revs in one minute; how can it do way less revs in one hour?
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
300*60 ...
 one year ago

moongazer Group TitleBest ResponseYou've already chosen the best response.1
sorry for that I interchanged it :) 18000 per hour
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
18000 revs in one hour put to the ratio of 80 miles 18000/80 is our next step i believe
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
of if we knew how many inches 80 miles was we could go more directly to an answer ....
 one year ago

moongazer Group TitleBest ResponseYou've already chosen the best response.1
why did you made it into ratio?
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
becasue that is what it is: 18000 revs = 80 miles i spose since we want to know how far 1 rev takes us its better to make the rev side equal to 1 tho divide both sides by 18000
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
1 rev = the circumference of the wheel
 one year ago

moongazer Group TitleBest ResponseYou've already chosen the best response.1
sorry I got confused :)
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
if we convert 80 miles to inches; then we know how many inches 1 rev is; so we would know how many inches the circumference of the wheel is knowing circunference is equal to 2pi*radius; we solve for the radius r = C/2pi
 one year ago

moongazer Group TitleBest ResponseYou've already chosen the best response.1
Sorry, but I am really confused with your method. :) I did angular and linear speed with this one.
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
google says: 1mile=63360inches multiply both sides by 80 we get 80 miles = 5 068 800 inches 18000 revs = 5 068 800 inches divide both sides by 18000 to get 1 revolution 5 068 800/ 18000 = 281.6 281.6 inches is our circumference therefore, using what i posted up above; radius = 281.6/(2pi)
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
i did the same, i converted angular (rpm) into linear (miles, inches)
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
of course i get about a wheel that is about 7 feet in diameter lol
 one year ago

moongazer Group TitleBest ResponseYou've already chosen the best response.1
brb. i'll try to understand your method. it looks good :) still, I think we got the same answer but different method of getting it.
 one year ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
44.82, yes
 one year ago

moongazer Group TitleBest ResponseYou've already chosen the best response.1
and I think your method is faster :)
 one year ago
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