6. 9 A disk of diameter d 1 rests on a table. A second disk of diameter d 2 is p

Question

6.  9

A disk of diameter d1 rests on a table. A second disk of diameter d2 is placed with its rim touching the rim of the first disk. See the figure below. You hold the inner disk down so it does not move, and you roll the outer disk around the circumference of the first one, making sure that there is no slipping of the disk. If

how many revolutions does it make in one round trip?
rev

disk of diameter d1 rests on a table. A second disk of diameter d2 is placed with its rim touching the rim of the first disk. See the figure below. You hold the inner disk down so it does not move, and you roll the outer disk around the circumference of the first one, making sure that there is no slipping of the disk. If d1 = 1.5d2, how many revolutions does it make in one round trip?

Explanation / Answer

d1 =1.5 d2

==> r1 = 1.5 r2

==> 2 pi r1 = 1.5 (2 pi r2)

==> Answer is: 1.5 rev

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