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April 24, 2014

Homework Help: physics

Posted by Help Please! on Sunday, January 23, 2011 at 11:20pm.

A yo-yo has a rotational inertia of 810 gcm2 and a mass of 95 g. Its axle radius is 2.6 mm and its string is 100 cm long. The yo-yo is thrown so that its its initial speed down the string is 1.0 m/s.
(a) How long does the yo-yo take to reach the end of the string?
s
(b) As it reaches the end of the string, what is its total kinetic energy?
J
(c) As it reaches the end of the string, what is its translational speed?
m/s
(d) As it reaches the end of the string, what is its translational kinetic energy?
J
(e) As it reaches the end of the string, what is its rotational speed?
rad/s
(f) As it reaches the end of the string, what is its rotational kinetic energy?
J

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