As a storm front moves in, you notice that the column of mercury in a barometer rises to only 721 mm. You may want to review (Page 508). • Part A What is the air pressure? Templates Symbols undo redo keyboard shortcuts Help P= 961292.49 Pa Submit Prevlous Anewers Request Answer X Incorrect; Try Again; 5 attempts remaining • Part B If the mercury in this barometer is replaced with water, to what height does the column of water rise? Assume the same air pressure found in part A. Temgiates Symbols undo redo Tese keyboard shortcuts Help h = 9805.6 Im Submit Prevlous Answers Requeet Answer X Incorrect; Try Again; 5 attempts remaining

As a storm front moves in, you notice that the column of mercury in a barometer rises to only 721 mm. You may want to review (Page 508). • Part A What is the air pressure? Templates Symbols undo redo keyboard shortcuts Help P= 961292.49 Pa Submit Prevlous Anewers Request Answer X Incorrect; Try Again; 5 attempts remaining • Part B If the mercury in this barometer is replaced with water, to what height does the column of water rise? Assume the same air pressure found in part A. Temgiates Symbols undo redo Tese keyboard shortcuts Help h = 9805.6 Im Submit Prevlous Answers Requeet Answer X Incorrect; Try Again; 5 attempts remaining

Astronomy

1st Edition

ISBN:9781938168284

Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Publisher:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Chapter16: The Sun: A Nuclear Powerhouse

Section: Chapter Questions

Problem 19E: Earth’s atmosphere is in hydrostatic equilibrium. What this means is that the pressure at any point...

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The density of air is 1.3 kg/m3 at sea level. From your knowledge of air pressure at ground level, estimate the height of the atmosphere. As a simplifying assumption, take the atmosphere to be of uniform density up to some height, after which the density rapidly falls to zero. (In reality, the density of the atmosphere decreases as we go up.) (This question is courtesy of Edward F. Redish. For more questions of this type, see http://www.physics.umd.edu/perg/.)
What is the pressure at the bottom of the column of air referred to in the question 1? Question 1 What is the approximate mass of a column of air 1 cm2 in area that extends from sea level to the upper atmosphere? What is the weight of this amount of air?
Earth’s atmosphere is in hydrostatic equilibrium. What this means is that the pressure at any point in the atmosphere must be high enough to support the weight of air above it. How would you expect the pressure on Mt. Everest to differ from the pressure in your classroom? Explain why.
Is there a net force on a due to atmospheric pressure? Explain your answer.
Explain what it means when we say that Earth’s oceans are in hydrostatic equilibrium. Now suppose you are a scuba diver. Would you expect the pressure to increase or decrease as you dive below the surface to a depth of 200 feet? Why?
At ground level, the air pressure measured with a barometer is 1000 mb. The barometer is lifted upward by a weather balloon. When the balloon reaches 2 km above the ground, the measured air pressure is 800 mb. Explain why the air pressure decreased. After the balloon goes up another 2 km (now 4 km above the ground), will the measured air pressure be exactly 600 mb, lower than 600 mb, or higher than 600 mb? Explain the reason for your answer. Hint: This can be a little tricky. You need to consider how air density changes as you move upward. See the figure below. If air density does not change as you move upward, then the "block" or air from 2- 4 km weighs the same as the "block" of air from 0 - 2 km and the air pressure will decrease uniformly to be exactly 600 mb at 4 km. If air density changes as you move upward, then the "block" of air from 2 - 4 km will not weigh the same as the block of air from 0 - 2 km and so the air pressure will not be exactly 600 mb at 4 km.
What is atmospheric pressure? Give an expression for change in atmospheric pressure with height.
Calculate the pressure below a sea level by a distance 10 m (consider theatmospheric pressure = 105 Pa and the density of the water = 1000 kg/m3,and the acceleration of gravity g=10 m/s2).
Calculate the total force of the atmosphere acting on the top of atable measuring 1.60 mx 2.90 m. b) What is the total force acting upwardson the underside of the table? Build a representative diagram on eachcase.
An airport has occasionally been closed to large planes because ofweather conditions that do not entail storms or low visibility. Instead, the conditions combine to create an unusually low air density. Explain why such an air density would make it difficult for a large, heavy plane to take off, especially if the runway were not exceptionally long.
What is stagnation pressure? Explain how it can be measured.
Explain how a submarine uses Archimedes' principle to submerge and surface without the use of its propeller. How and why does a hot air balloon rise and fall? Even if you don't know the exact mechanisms, you should be able to make some general statements based on an understanding of Archimedes' principle.