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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Question: Suppose a person can reduce the pressure in his lungs to \({\bf{ - 75\;mm}}\)- Hg gauge pressure. How high can water then be "sucked" up a straw?
(II)A fish tank has dimensions 36 cm wide by 1.0 m long by 0.60 m high. If the filter should process all the water in the tank once every 3.0 h, what should the flow speed be in the 3.0 cm diameter input tube for the filter?
(I)Show that Bernoulli’s equation reduces to the hydrostatic variation of pressure with depth (Eq. 10-3b) when there is no flow\(\left( {{v_1} = {v_2} = 0} \right)\).
(II) If the base of an insect’s leg has a radius of about \(3.0 \times 1{0^{{\bf{ - }}5}}\;m\) and the insect’s mass is 0.016 g, would you expect the six-legged insect to remain on top of the water? Why or why not?
Three containers are filled with water to the same height and have the same surface area at the base, but the total weight of water is different for each (Fig. 10–46). In which container does the water exert the greatest force on the bottom of the container?
(a) Container A.
(b) Container B.
(c) Container C.
(d) All three are equal
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