Conceptual Physics (12th Edition)
12th Edition
ISBN: 9780321909107
Author: Paul G. Hewitt
Publisher: PEARSON
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Chapter 13, Problem 30RCQ
Soap greatly weakens the cohesive forces between water molecules. You can see this by adding some oil to a bottle of water and shaking it so that the oil and water mix. Notice that the oil and water quickly separate as soon as you stop shaking the bottle. Now add some liquid soap to the mixture. Shake the bottle again and you will see that the soap makes a fine film around each little oil bead and that a longer time is required for the oil to coalesce after you stop shaking the bottle. This is how soap works in cleaning. It breaks the surface tension around each particle of dirt so that the water can reach the particles and surround them. The dirt is carried away in rinsing. Soap is a good cleaner only in the presence of water.
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Chapter 13 Solutions
Conceptual Physics (12th Edition)
Ch. 13 - Prob. 1RCQCh. 13 - Prob. 2RCQCh. 13 - What is the relationship between liquid pressure...Ch. 13 - Prob. 4RCQCh. 13 - Prob. 5RCQCh. 13 - Prob. 6RCQCh. 13 - Prob. 7RCQCh. 13 - Why isn’t there a horizontal buoyant force on a...Ch. 13 - Prob. 9RCQCh. 13 - Prob. 10RCQ
Ch. 13 - Prob. 11RCQCh. 13 - Prob. 12RCQCh. 13 - If a 1-L container is immersed halfway into water,...Ch. 13 - Prob. 14RCQCh. 13 - Prob. 15RCQCh. 13 - Prob. 16RCQCh. 13 - Prob. 17RCQCh. 13 - How is the density of a fish controlled? How is...Ch. 13 - It was emphasized earlier that the buoyant force...Ch. 13 - Why do the gondolas of the Falkirk Wheel (see...Ch. 13 - Prob. 21RCQCh. 13 - Prob. 22RCQCh. 13 - Prob. 23RCQCh. 13 - Prob. 24RCQCh. 13 - Prob. 25RCQCh. 13 - How does the height to which water is lifted in a...Ch. 13 - Place an egg in a pan of tap water. Then dissolve...Ch. 13 - If you punch a couple of holes in the bottom of a...Ch. 13 - Float a water-soaked Ping-Pong ball in a can of...Ch. 13 - Soap greatly weakens the cohesive forces between...Ch. 13 - Sprinkle some black pepper on the surface of some...Ch. 13 - Pressure = force/area 31. Calculate the pressure a...Ch. 13 - Pressure= weight density X depth (Use 10,000 N/m3...Ch. 13 - Show that the water pressure at the bottom of the...Ch. 13 - Prob. 35RCQCh. 13 - The top floor of a building is 20 m above the...Ch. 13 - Calculate the average force per nail when Sara,...Ch. 13 - Suppose that you balance a 5-kg ball on the tip of...Ch. 13 - A 12-kg piece of metal displaces 2 L of water when...Ch. 13 - A 1-m-tall barrel is closed on top except for a...Ch. 13 - A dike in Holland springs a leak through a hole of...Ch. 13 - In lab you find that a 1-kg rock suspended above...Ch. 13 - A merchant in Katmandu sells you a solid gold 1-kg...Ch. 13 - In the hydraulic pistons shown in the sketch, the...Ch. 13 - Your friend of mass 100 kg can just barely float...Ch. 13 - Rank the pressures from greatest to least for the...Ch. 13 - Rank the following from greatest to least for the...Ch. 13 - Think about what happens to the volume of an...Ch. 13 - Prob. 49RCQCh. 13 - Prob. 50RCQCh. 13 - Prob. 51RCQCh. 13 - Prob. 52RCQCh. 13 - Prob. 53RCQCh. 13 - Prob. 54RCQCh. 13 - Prob. 55RCQCh. 13 - Prob. 56RCQCh. 13 - Prob. 57RCQCh. 13 - Prob. 58RCQCh. 13 - Prob. 59RCQCh. 13 - Prob. 60RCQCh. 13 - Prob. 61RCQCh. 13 - Prob. 62RCQCh. 13 - Prob. 63RCQCh. 13 - If you’ve wondered about the flushing of toilets...Ch. 13 - Prob. 65RCQCh. 13 - Prob. 66RCQCh. 13 - Prob. 67RCQCh. 13 - Why is it easier to float in saltwater than in...Ch. 13 - Prob. 69RCQCh. 13 - Prob. 70RCQCh. 13 - Prob. 71RCQCh. 13 - Prob. 72RCQCh. 13 - Prob. 73RCQCh. 13 - Prob. 74RCQCh. 13 - Prob. 75RCQCh. 13 - Why does an inflated beach ball pushed beneath the...Ch. 13 - Prob. 77RCQCh. 13 - Prob. 78RCQCh. 13 - Prob. 79RCQCh. 13 - Will a swimmer gain or lose buoyant force as she...Ch. 13 - Prob. 81RCQCh. 13 - The weight of the human brain is about 15 N. The...Ch. 13 - Prob. 83RCQCh. 13 - Prob. 84RCQCh. 13 - Prob. 85RCQCh. 13 - Prob. 86RCQCh. 13 - Prob. 87RCQCh. 13 - Prob. 88RCQCh. 13 - Prob. 89RCQCh. 13 - Prob. 90RCQCh. 13 - Prob. 91RCQCh. 13 - If you release a Ping-Pong ball beneath the...Ch. 13 - So you’re having a run of bad luck, and you slip...Ch. 13 - Prob. 94RCQCh. 13 - Prob. 95RCQCh. 13 - Prob. 96RCQCh. 13 - Prob. 97RCQCh. 13 - Prob. 98RCQCh. 13 - The photo shows physics instructor Marshall...Ch. 13 - Prob. 100RCQCh. 13 - Prob. 101RCQCh. 13 - There is a story about Pascal’s assistant climbing...Ch. 13 - Prob. 103RCQCh. 13 - A piece of iron placed on a block of wood makes...Ch. 13 - Prob. 105RCQCh. 13 - Prob. 106RCQCh. 13 - Prob. 107RCQCh. 13 - Would the water level in a canal lock go up or...Ch. 13 - Prob. 109RCQCh. 13 - Prob. 110RCQCh. 13 - Prob. 111RCQCh. 13 - Prob. 112RCQCh. 13 - Prob. 113RCQCh. 13 - Prob. 114RCQ
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