# Thread: Revolutions Per Minutes

1. ## Revolutions Per Minutes

A pulley that has a diameter of 8 inches is belted to a pulley that has a diameter of 12 inches. The 8-inch-diameter pulley is running at 1,548 revolutions per minute. If the speeds of the pulleys vary inverselyto their diameters, how many revolutions per minute does the larger pulley make?

2. ## ..try this

A pulley that has a diameter of 8 inches is belted to a pulley that has a diameter of 12 inches. The 8-inch-diameter pulley is running at 1,548 revolutions per minute. If the speeds of the pulleys vary inverselyto their diameters, how many revolutions per minute does the larger pulley make?
---according to question-----
speed=k/diameter......(k=arbitary constant)
now applying for first and second pulley
u get
8=k/1548......(1)
12=k/?..........(2)
get k from ( 1) put it in (2) u get the ans

3. ## great....

Originally Posted by ADARSH
A pulley that has a diameter of 8 inches is belted to a pulley that has a diameter of 12 inches. The 8-inch-diameter pulley is running at 1,548 revolutions per minute. If the speeds of the pulleys vary inverselyto their diameters, how many revolutions per minute does the larger pulley make?
---according to question-----
speed=k/diameter......(k=arbitary constant)
now applying for first and second pulley
u get
8=k/1548......(1)
12=k/?..........(2)
get k from ( 1) put it in (2) u get the ans
I can take it from here.