Chapter 10: Q2P (page 260)
(I) What is the approximate mass of air in a living room 5.6× 3.6× 2.4m?
The mass of the air is 62.4 Kg.
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(I) State your mass and then estimate your volume. [Hint: Because you can swim on or just under the surface of the water in a swimming pool, you have a pretty good idea of your density.
Show that the power needed to drive a fluid through a pipe with uniform cross-section is equal to the volume rate of flow, \({\bf{Q}}\), times the pressure difference \({{\bf{P}}_{\bf{1}}}{\bf{ - }}{{\bf{P}}_{\bf{2}}}\), Ignore viscosity.
(II)What gauge pressure in the water pipes is necessary if a fire hose is to spray water to a height of 16 m?
A beaker of water rests on an electronic balance that reads 975.0 g. A 2.6-cm-diameter solid copper ball attached to a string is submerged in the water, but does not touch the bottom. What are the tension in the string and the new balance reading?
Roofs of houses are sometimes “blown” off (or are they pushed off?) during a tornado or hurricane. Explain using Bernoulli’s principle.
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