Friday

October 24, 2014

October 24, 2014

Posted by **vincent** on Monday, July 29, 2013 at 8:24pm.

not just an answer please

A.120

B.160

C.360

D.420

E.480

- math -
**Reiny**, Monday, July 29, 2013 at 9:35pmshort way:

the number of revolutions varies inversely with the diameter of the wheel

i.e. the larger the wheel the smaller the number of revs.

R1/R2 = C2/C1

240/R2 = 20/30

20R2 = 7200

R2 = 360

or

distance covered by first wheel = 2π(15)(240) = 7200π inches

circumference of 2nd wheel = 2π(10) = 20π inches

for the same distance of 7200π inches

number of revolutions = 7200π/(20π) = 360 revs

**Answer this Question**

**Related Questions**

Physics - There are two wheels with diameter 30 inches and 20 inches. The first ...

Statistics - The inside diameter of the automobile wheel bearing sets at a ...

Math - A bicycle wheel is 30 inches in diameter. a. to the nearest revolution, ...

Geometry - A wheel of a motor home has a diameter of 32 inches. How far will the...

algebra - a wheel with a diameter of 12 inches is spinning at 10 revolutions per...

Math - A bicycle wheel is 30 inches in diameter. a. To the nearest revolution,...

physics - If the rotational speed of each wheel is 9 revolution per second, what...

physics - If the rotational speed of each wheel is 9 revolution per second, what...

Precalc - 1. If a bicycle wheel has a diameter of 27 inches, find the radian ...

Precalc - 1. If a bicycle wheel has a diameter of 27 inches, find the radian ...