Essential University Physics (3rd Edition)
3rd Edition
ISBN: 9780134202709
Author: Richard Wolfson
Publisher: PEARSON
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Chapter 15, Problem 78P
A plumber conies to your ancient apartment building where you have a part-time job as caretaker. He’s checking the hot-water heating system, and notes that the water pressure in the basement is 18 psi. He asks, “How high is the building?” “Three stories, each about 11 feet,” you reply. “OK, about 33 feet,” he says, pausing to do some calculations in his head. “The pressure is fine,” he declares. On what basis did he come to that conclusion?
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You inflate the front tires on your car to 28 psi. Later,you measure your blood pressure, obtaining a reading of 120/80, the readings being in mm Hg. In metric countries (which is to say, most of the world), these pressures are customarily reported in kilopascals (kPa). In kilopascals, what are (a) your tire pressure and (b) your blood pressure?
An airplane passenger has a volume V1 of air in his stomach just before the plane takes off from a sea-level airport.
What volume will this quantity of air have at cruising altitude at the same temprerature ( body temp. ), in terms of V1, the pressure on the ground P1, and the cabin pressure at cruising altitude P2?
What is this volume, in cubic centimeters, if the initial volume is 110 cm^3 and the cabin pressure drops to 7.5x10^4 Pa when the plane is at cruising altitude?
Systemic blood pressure is expressed as the ratio of the systolic pressure (when the heart first ejects blood into the arteries{max}) to the diastolic pressure (when the heart is relaxed{min}). Systemic pressure = Systolic pressure / diastolic pressure. Both pressures are measured at the level of the heart and are expressed in millimeters of mercury although the units are not written. Normal systemic blood pressure is 120/80. What are the maximum and minimum forces (in Newtons) that the blood exerts against each square centimeter of the heart for a person with high blood pressure, 145 / 85 ?
Note: this is a conversion question...follow the units.
Answer to 2 sig figs. (1.013 x 10^5 N/m^2 = 760 mmHg =1 atm) (1m = 100 cm)
maximum force = {Systolic}
minimum force = {Diastolic
Chapter 15 Solutions
Essential University Physics (3rd Edition)
Ch. 15.1 - What quantity of water has the same mass as 1 m3...Ch. 15.2 - Neglecting friction and other nonconservative...Ch. 15.3 - The density of a rubber ball is three-fifths that...Ch. 15.4 - The photo shows smoke particles tracing...Ch. 15.5 - A large tank is filled with liquid to the level h1...Ch. 15 - Why do your ears pop when you drive up a mountain?Ch. 15 - Commercial aircraft cabins are usually pressurized...Ch. 15 - Water pressure at the bottom of the ocean arises...Ch. 15 - The three containers in Fig. 15.22 are filled to...Ch. 15 - Why is it easier to float in the ocean than in...
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