Chapter 10: Q7Q (page 260)
Why don鈥檛 ships made of the iron sink?
Short Answer
The overall density of the ship is less than the density of the water.
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Chapter 10: Q7Q (page 260)
Why don鈥檛 ships made of the iron sink?
The overall density of the ship is less than the density of the water.
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(I) What is the approximate mass of air in a living room 5.6脳 3.6脳 2.4m?
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?
(III) Estimate the diameter of a steel needle that can just barely remain on top of water due to surface tension.
(I) Calculate the force needed to move the wire in Fig. 10鈥34 if it holds a soapy solution (Table 10鈥4) and the wire is \(21.5\;cm\) long.
You need to siphon water from a clogged sink. The sink has an area of and is filled to a height of 4.0 cm. Your siphon tube rises 45 cm above the bottom of the sink and then descends 85 cm to a pail as shown in Fig. 10鈥59. The siphon tube has a diameter of 2.3 cm. (a) Assuming that the water level in the sink has almost zero velocity, use Bernoulli鈥檚 equation to estimate the water velocity when it enters the pail. (b) Estimate how long it will take to empty the sink. Ignore viscosity.

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