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April 24, 2014

Homework Help: physics

Posted by Allison on Thursday, April 21, 2011 at 5:30am.

The 4.00-kg block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended towards the rod and each have a length of 1.25. The length from the upper string and lower string on the rod is 2. So it forms a triangle with sides 2, 1.25, 1.25; with the block between the 1.25 sides. The tension in the upper string is 85.0 N . Tension of the lower cord is 36 N.


a) How many revolutions per minute does the system make?

b)Find the number of revolutions per minute at which the lower cord just goes slack.

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