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1. A 2.0 kg ball is attached to a vertical post with two strings, one 2 m long and the other 1 m long. If the ball is set whirling in a horizantal circle, what is the minimum speed necessary for the lower string to be taught? If the ball has a constant speed of 6 m/s, find the tension on each string.

2. At the end of a factory production line, boxes start from rest and slide down a 30o ramp 5.4 m long. If the slide is to take no more than 3.3 s, what is the maximum coefficient of friction between the box and the slide?

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