Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
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
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

This Question is Closed

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

amistre64Best ResponseYou've already chosen the best response.1
how many revolutions per hour does it make?
 one year ago

amistre64Best 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

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

amistre64Best 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

amistre64Best 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

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

amistre64Best 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

amistre64Best ResponseYou've already chosen the best response.1
1 rev = the circumference of the wheel
 one year ago

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

amistre64Best 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

moongazerBest 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

amistre64Best 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

amistre64Best ResponseYou've already chosen the best response.1
i did the same, i converted angular (rpm) into linear (miles, inches)
 one year ago

amistre64Best 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

moongazerBest 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

moongazerBest ResponseYou've already chosen the best response.1
and I think your method is faster :)
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.