Revolutions Per Minutes

Jul 2008
1,489
16
NYC
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?
 

ADARSH

MHF Hall of Honor
Aug 2008
726
286
India
..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
 
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Jul 2008
1,489
16
NYC
great....

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.