Homework Help: Physics

Posted by Amanda on Tuesday, March 27, 2012 at 10:38pm.

You like to swim at a nearby lake. On one side of the lake is a cliff, and the top of the cliff is 36m above the surface of the lake. You dive off the cliff doing somersaults so as to have an angular speed of 6rev/min. How many revolutions do you make before you hit the water? Assume your initial centre of mass velocity is horizontal and you begin from a standing position. Do you enter the water head or feet first?

Physics - drwls, Wednesday, March 28, 2012 at 9:49am
Time to fall H = 36 m =
t = sqrt(2H/g) = 2.71 s
Number of rotations on the way down =
6.0 rev/min*(2.71/60)min = 0.27 rev

The diver would land in a belly flop.

6 rev/min is an extremely slow somersaulting rate. Are you sure that is the right number and dimension?

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