A 38.0 kg child swings in a swing supported by two chains, Ask an Expert

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Q1. A 38.0 kg child swings in a swing supported by two chains, each 3.04m long. The tension in each chain at the lowest point is 429N. Find out the child's speeds at the lowest point.

Q2. An isolated copper sphere of radius 4.55 cm, at first uncharged, is illuminated by ultraviolet light of wavelength 188nm. What charge (in pC) does photoelectric effect induce in the sphere? The work function for copper is 4.70 eV.

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