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Q. A 36 g ball is fired horizontally with initial speed v_0 toward a 110 g ball that is hanging motionless from a 1.1 m-long string. The balls undergo a head-on, perfectly elastic collision, after which the 110 g ball swings out to a maximum angle theta_max = 51^circ.

Q. When you go out to your car one cold winter morning you discover a 0.54- thick layer of ice on the windshield, which has an area of 1.6 . If the temperature of the ice is -9.0, and its density is 917 , find the heat required to melt all the ice.

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