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12_Physics ProblemsTechnical Physics

# 12_Physics ProblemsTechnical Physics - 12 P1.44 Physics and...

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12 Physics and Measurement P1.44 A typical raindrop is spherical and might have a radius of about 0.1 inch. Its volume is then approximately 41 0 3 × in 3 . Since 1 acre 43 560 ft 2 = , the volume of water required to cover it to a depth of 1 inch is 1 acre 1 inch 1 acre in ft 1 acre in ft 6.3 10 in 63 af a f a f =⋅ F H G I K J F H G I K J ≈× 43 560 144 1 2 2 2 . The number of raindrops required is n == × × volume of water required volume of a single drop in in . 63 10 0 1 6 10 10 33 99 . ~. *P1.45 Assume the tub measures 1.3 m by 0.5 m by 0.3 m. One-half of its volume is then V 05 13 05 03 010 .. . . . a f m m m 3 . The mass of this volume of water is mV water water kg m m kg kg = ρ 1 000 0 10 100 10 2 ej e j .~ . Pennies are now mostly zinc, but consider copper pennies filling 50% of the volume of the tub. The mass of copper required is copper copper kg m m kg kg = 8 920 0 10 892 10 3 e j . P1.46 The typical person probably drinks 2 to 3 soft drinks daily. Perhaps half of these were in aluminum
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