12 Physics and MeasurementP1.44A typical raindrop is spherical and might have a radius of about 0.1 inch. Its volume is thenapproximately 4103×−in3. Since 1 acre43 560 ft2=, the volume of water required to cover it to adepth of 1 inch is1 acre 1 inch1 acre inft1 acreinft6.3 10 in63afa faf=⋅FHGIKJFHGIKJ≈×43 5601441222.The number of raindrops required isn==××=×−volume of water requiredvolume of a single dropinin.63 1001 6 10103399.~.*P1.45Assume the tub measures 1.3 m by 0.5 m by 0.3 m. One-half of its volume is thenV05 130503010.....afm mm3.The mass of this volume of water ismVwaterwaterkg mmkgkg=ρ1 0000 10100102ejej.~.Pennies are now mostly zinc, but consider copper pennies filling 50% of the volume of the tub. Themass of copper required iscoppercopperkg mmkgkg=8 9200 10892103ej.P1.46The typical person probably drinks 2 to 3 soft drinks daily. Perhaps half of these were in aluminum
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Imperial units, United States customary units, Inch, JK GH