Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 173
s, whilethe Mauretania, of the Cunard Line, having aspeed of 2.5 knots, has engines of 70,000 horsepower, although the total weight when loaded isonly 32,.500 tons. QUESTIONS AND PROBLEMS 1. Mention three ways of lessening friction in machinery. 2. Tn what resi>ects is friction an advantage, and… … Fig. 162. Roller bear-ings of automobile frontwheel EFFICIENCY 147 5. Why is sand often placed on a track in starting a heavy train ? 6. In what way is friction an advantage in lifting buildings with ajackscrew ? In what way is it a disadvantage ? 7. A smooth block is 10 x 8 x o in. Compare the…
Physics
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