Homework Help: PHYSICS CIRCULAR MOTION

Posted by Gina on Tuesday, February 15, 2011 at 7:41pm.

In an automatic clothes drier, a hollow cylinder moves the clothes on a vertical circle (radius r = 0.364 m), as the drawing shows. The appliance is designed so that the clothes tumble gently as they dry. This means that when a piece of clothing reaches an angle of è above the horizontal, it loses contact with the wall of the cylinder and falls onto the clothes below. How many revolutions per second should the cylinder make in order that the clothes lose contact with the wall when è = 66.0 °?

PHYSICS CIRCULAR MOTION - Damon, Tuesday, February 15, 2011 at 8:00pm
mg down
m v^2/r radial = m r w^2 where w = 2 pi f
vertical component of radial =m rw^2 sin e
falls when total vertical force = 0

m g = m r w^2 sin e
or
w^2 = g/(r sin e)
w^2 = 9.8 /(.364 sin 66)
find w
find f = w/2pi

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