Friday
April 18, 2014

Homework Help: physics

Posted by kirafreedom on Saturday, March 23, 2013 at 12:32am.

a yo-yo is spun from rest by pulling on the string with a constant tension of 2.0N. The radius of the inner rod on which the string is strung around is 0.50cm. the tension applied for 5.0seconds after which the yo-yo is observed to spin with an angular velocity of 15 rad/sec

a)from the information given above, what is the moment of inertia of the yo-yo

b) what is the total angle the yo-yo has traveled through in these 5.0 seconds

Now you press your finger against the outer rim of the yo-yo ( which has a radius of 4.0 cm) to bring it to a stop. You apply a constant force of 2.0N directed perpendicular to the rim of the yo-yo. The tension from part a) is no longer being applied to the yo-yo. The coefficient of kinetic friction between you finger and the edge of the yo-yo is 0.80.

c) how ling does it take for the yo-yo to come to a stop

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