Conceptual Physics: The High School Physics Program
9th Edition
ISBN: 9780133647495
Author: Paul G. Hewitt
Publisher: Prentice Hall
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Textbook Question
Chapter 20, Problem 67A
Place a card over the open top of a glass filled to the brim with water, and invert it. What happens? Why? Try turning the glass sideways as shown below.
Expert Solution & Answer
To determine
To explain: The effect on a glass of water along with reason.
Answer to Problem 67A
The water will not come out of glass.
Explanation of Solution
Introduction:
Atmospheric pressure: It is the force exert by atmospheric weight. Its unit is pascal.
When a card is placed at the top of a glass filled with water, at that time at the top of the glass a small pocket of air is created and more air molecules cannot get into that space, hence a small pocket of low pressure is created. When this glass of water is inverted that time air molecules which are present in large amount outside the glass exert pressure at the bottom of the card, due to which higher pressure area is created in comparison to lower pressure area inside the glass. The force produced from atmospheric pressure holds card up and due to low pressure zone in the glass card will not get pushed down hence water will not come out of glass.
Conclusion: The water will not come out of glass.
Chapter 20 Solutions
Conceptual Physics: The High School Physics Program
Ch. 20 - Prob. 1ACh. 20 - How does the density of gases at different...Ch. 20 - What causes atmospheric pressure?Ch. 20 - Why doesnt the pressure of the atmosphere break...Ch. 20 - What is the mass of a cubic meter of air at 20C at...Ch. 20 - Prob. 6ACh. 20 - Prob. 7ACh. 20 - How does the pressure at the bottom of the 76-cm...Ch. 20 - When you drink liquid through a straw, it is more...Ch. 20 - Why will a vacuum pump not operate for a well that...
Ch. 20 - The atmosphere does not ordinarily crush cans. Yet...Ch. 20 - What property of atmospheric pressure is used by...Ch. 20 - When air is compressed, what happens to its...Ch. 20 - A piston in an airtight pump is withdrawn so that...Ch. 20 - When you squeeze an air-filled toy balloon to half...Ch. 20 - a. How much buoyant force acts on a 1-N balloon...Ch. 20 - When the speed of a fluid flowing in a horizontal...Ch. 20 - Prob. 18ACh. 20 - In addition to Bernoullis principle, what other...Ch. 20 - Why does a spinning ball curve in flight?Ch. 20 - Calculate the density of a gas with a mass of 4.29...Ch. 20 - Calculate the density of a gas with a mass of...Ch. 20 - An inflated balloon has internal pressure P1. Use...Ch. 20 - Use Boyles law to calculate the pressure on the...Ch. 20 - Calculate the lift on a model airplane wing with...Ch. 20 - We can understand how pressure in water depends on...Ch. 20 - Prob. 27ACh. 20 - Which would weigh more—a bottle filled with...Ch. 20 - Prob. 29ACh. 20 - From Table 20.1, which filling would be more...Ch. 20 - A helium-filled balloon pulls upward on its...Ch. 20 - Prob. 32ACh. 20 - How would the density of air at the bottom of a...Ch. 20 - Atmospheric pressure is nicely demonstrated with...Ch. 20 - Relative to sea level, would it be slightly more...Ch. 20 - If there were a liquid twice as dense as mercury,...Ch. 20 - Before boarding an airplane, you buy a bag of...Ch. 20 - Why do you suppose that airplane windows are...Ch. 20 - Why do your ears pop' when you ascend to higher...Ch. 20 - Prob. 40ACh. 20 - When you squeeze an air-filled toy balloon, its...Ch. 20 - Prob. 42ACh. 20 - It is easy to breathe when snorkeling with only...Ch. 20 - Prob. 44ACh. 20 - a. Would a balloon rise in an atmosphere where the...Ch. 20 - The buoyant force of air is considerably greater...Ch. 20 - Why is it that when cars pass each other at high...Ch. 20 - In a department store, an air stream from a hose...Ch. 20 - What physics principle underlies the following...Ch. 20 - Prob. 50ACh. 20 - The diameter of a fire hose varies with the flow...Ch. 20 - You overhear a conversation between two physics...Ch. 20 - Explain how an airplane is able to fly upside...Ch. 20 - A typical school gym is about 60.0m30.0m10.0m....Ch. 20 - The 'height' of the atmosphere is about 30 km. The...Ch. 20 - Prob. 56ACh. 20 - Average atmospheric pressure at Earths surface is...Ch. 20 - A party balloon is squeezed to 2/3 of its initial...Ch. 20 - An automobile is supported by four tires inflated...Ch. 20 - Prob. 60ACh. 20 - A mercury barometer reads 760 mm at sea level....Ch. 20 - Prob. 62ACh. 20 - Referring to the previous problem, find the volume...Ch. 20 - In 1982 Larry Walters ascended from his home in...Ch. 20 - How many newtons of lift are exerted on the wings...Ch. 20 - Try this in the bathtub or while washing dishes....Ch. 20 - Place a card over the open top of a glass filled...Ch. 20 - Fill a bottle with water and hold it partially...Ch. 20 - Hold a spoon in a stream of water, as shown....
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