Question

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.

I think it has something to do with linear and angular speed :)

Answer 1

please help :)

Answer 2

Your first target is to find it's circumference.

Answer 3

Calculate the speed per minute by dividing the wheel speed
Multiply the miles per minute speed times 60 to convert the speed to miles per hour (mph).

Answer 4

Thats all!

Answer 5

how do I do that?

Answer 6

@saifoo.khan What should I do next?

Answer 7

i will brb.

Answer 8

ok :)

Answer 9

Moon the tips are given still you are unable to solve!

Answer 10

yes you r right..

V = rw

where V = linear velocity and w = angular velocity...

Answer 11

See they did it! especially @Ganpat

Answer 12

I'll try to do it :)

Answer 13

Good Luck

Answer 14

v = 80 miles/ hr
r = find ??
w = (2 * pi * N )/ 60..

N = 300 rev /min = 300 * 60 = 1800 rev / hr..

Now put everything in the formula and look for the unknown.. i.e. r..

V = rw ...

Answer 15

@Ganpat I did a slightly different method. I got r=140.8 inches. is it right?

Answer 16

I rechecked it I got r=44.82 inches

Answer 17

yes it is correct!

Answer 18

which one?

Answer 19

44.82 inches

Answer 20

Thanks :)

Answer 21

I forgot the pi with my first answer :)