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Q1. A rock of mass m = 1.0 kg is tied to a string of length L = 1.9 m and is twirled in a vertical circle. The speed v of the rock is constant; that is, it is the same at the top and the bottom of the circle. If the tension in the string is zero when the rock is at its highest point (so that the string just barely goes slack), what is the tension while rock is at the bottom?

Q2. A sheet of glass has an a narrow beam of white light is incident on the glass at 32.0.

What is an angular spread of the light inside the glass?

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