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Q. Two 2.3 kg balls are attached to the ends of a thin rod of negligible mass, 65 cm in length. The rod is free to rotate in a vertical plane about a horizontal axis through its center. With the rod initially horizontal, a 44 gm wad of wet putty drops onto one of the balls with a speed of 3.7 m/sec and sticks to it.

Q. The light from a red laser pointer has a wavelength of about 600 nm. If this laser has a power of 0.18 mW, what is the momentum carried by a 3.9-s pulse of this radiation?

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