Saturday, January 21, 2012

Pulleys Puzzle

In the following figure, the diameter of pulley P1 is twice that of pulley P2, as the diameter of pulley P3 is twice that of pulley P4. If pulley P3 rotates 15 times, how many times will pulley P1 rotate?


Pulleys Puzzle


Scroll down to see the answer!




































































Answer: 8 times.

Pulley P4 rotates 30 times; while its pinion with 8 teeth rotates 30 times too (30 * 8 = 240 teeth-based rotations). The pinion of pulley P2 has 15 teeth; so it rotates 240 / 15 = 16 times that makes pulley P1 rotate 8 times!


No comments:

Post a Comment