Physical Universe
15th Edition
ISBN: 9780077510534
Author: KRAUSKOPF
Publisher: Mcgraw-hill Higher Education (us)
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Chapter 5, Problem 50E
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The rise of the raft.
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The figure below shows, at left, a solid disk of radius R = 0.600 m and mass 75.0 kg.
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Mounted directly to it and coaxial with it is a pulley with a much smaller mass and a radius of r = 0.230 m. The disk and pulley assembly are on a frictionless axle. A belt is wrapped around the pulley and connected to an electric motor as shown on the right. The turning motor gives the disk
and pulley a clockwise angular acceleration of 1.67 rad/s². The tension T in the upper (taut) segment of the belt is 145 N.
(a) What is the tension (in N) in the lower (slack) segment of the belt?
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(b) What If? You replace the belt with a different one (one slightly longer and looser, but still tight enough that it does not sag). You again turn on the motor so that the disk accelerates clockwise. The upper segment of the belt once again has a tension of 145 N, but now the tension in
the lower belt is exactly zero. What is the magnitude of the angular acceleration (in rad/s²)?
rad/s²
A bridge truss extends x = 217 m across a river (shown in the figure below) where 0 = 40°. The structure is free to slide horizontally to permit thermal expansion. The structural components are connected by pin joints, and the masses of the bars are small compared with the mass of a
1300 kg car at the center. Calculate the force of tension or compression in each structural component (in N).
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Chapter 5 Solutions
Physical Universe
Ch. 5 - Prob. 1MCCh. 5 - One gram of steam at 100C causes a more serious...Ch. 5 - Prob. 3MCCh. 5 - Heat transfer in a vacuum can occur by a....Ch. 5 - The fluid at the bottom of a container is a. under...Ch. 5 - The pressure of the earths atmosphere at sea level...Ch. 5 - Prob. 7MCCh. 5 - The density of freshwater is 1.00 g/cm3 and that...Ch. 5 - Prob. 9MCCh. 5 - Prob. 10MC
Ch. 5 - Prob. 11MCCh. 5 - Prob. 12MCCh. 5 - Prob. 13MCCh. 5 - Absolute zero may be regarded as that temperature...Ch. 5 - Prob. 15MCCh. 5 - Prob. 16MCCh. 5 - Prob. 17MCCh. 5 - Prob. 18MCCh. 5 - Prob. 19MCCh. 5 - When a vapor condenses into a liquid, a. its...Ch. 5 - Prob. 21MCCh. 5 - Prob. 22MCCh. 5 - Prob. 23MCCh. 5 - Prob. 24MCCh. 5 - Prob. 25MCCh. 5 - The physics of a refrigerator most closely...Ch. 5 - Prob. 27MCCh. 5 - Prob. 28MCCh. 5 - Prob. 29MCCh. 5 - The second law of thermodynamics does not lead to...Ch. 5 - Prob. 31MCCh. 5 - Prob. 32MCCh. 5 - Prob. 33MCCh. 5 - Prob. 34MCCh. 5 - Prob. 35MCCh. 5 - Prob. 36MCCh. 5 - Prob. 37MCCh. 5 - Prob. 38MCCh. 5 - Prob. 39MCCh. 5 - A wooden plank 200 cm long, 30 cm wide, and 40 mm...Ch. 5 - Prob. 41MCCh. 5 - Prob. 42MCCh. 5 - Prob. 43MCCh. 5 - Prob. 44MCCh. 5 - Prob. 45MCCh. 5 - Running hot water over the metal lid of a glass...Ch. 5 - When a mercury-in-glass thermometer is heated, its...Ch. 5 - Three iron bars are heated in a furnace to...Ch. 5 - Why do you think the Celsius temperature scale is...Ch. 5 - Normal room temperature is about 20C. What is this...Ch. 5 - What is the Celsius equivalent of a temperature of...Ch. 5 - Prob. 7ECh. 5 - You have a Fahrenheit thermometer in your left...Ch. 5 - Why is a piece of ice at 0C more effective in...Ch. 5 - Would it be more efficient to warm your bed on a...Ch. 5 - A cup of hot coffee can be cooled by placing a...Ch. 5 - A 150-L water heater is rated at 8 kW. If 20...Ch. 5 - Prob. 13ECh. 5 - Prob. 14ECh. 5 - Prob. 15ECh. 5 - Prob. 16ECh. 5 - Prob. 17ECh. 5 - An essential part of a home solar heating system...Ch. 5 - A 10-kg stone is dropped into a pool of water from...Ch. 5 - Why do tables of densities always include the...Ch. 5 - A room is 5 m long, 4 m wide, and 3 m high. What...Ch. 5 - A 156-kg coil of sheet steel is 0.80 mm thick and...Ch. 5 - A 50-g bracelet is suspected of being gold-plated...Ch. 5 - Prob. 24ECh. 5 - Mammals have approximately the same density as...Ch. 5 - Prob. 26ECh. 5 - Prob. 27ECh. 5 - Some water is boiled briefly in an open metal can....Ch. 5 - When a person drinks a soda through a straw, where...Ch. 5 - Prob. 30ECh. 5 - The three containers shown in Fig. 5-55 are filled...Ch. 5 - A 60-kg swami lies on a bed of nails with his body...Ch. 5 - A tire pump has a piston whose cross-sectional...Ch. 5 - Prob. 34ECh. 5 - A 1200-lb car is equally supported by its four...Ch. 5 - The smallest bone in the index finger of a 75-kg...Ch. 5 - A hypodermic syringe whose cylinder has a...Ch. 5 - Prob. 38ECh. 5 - Why does buoyancy occur? Under what circumstances...Ch. 5 - Two balls of the same size but of different mass...Ch. 5 - A wooden block is submerged in a tank of water and...Ch. 5 - Prob. 42ECh. 5 - Prob. 43ECh. 5 - Prob. 44ECh. 5 - Prob. 45ECh. 5 - Prob. 46ECh. 5 - Prob. 47ECh. 5 - Prob. 48ECh. 5 - Prob. 49ECh. 5 - Prob. 50ECh. 5 - Prob. 51ECh. 5 - Prob. 52ECh. 5 - A 200-L iron tank has a mass of 36 kg. (a) Will it...Ch. 5 - What are the equivalents of 0 K, 0C, and 0F in the...Ch. 5 - A certain quantity of hydrogen occupies a volume...Ch. 5 - A tire contains air at a pressure of 2.8 bar at...Ch. 5 - Prob. 57ECh. 5 - A weather balloon carries instruments that measure...Ch. 5 - To what Celsius temperature must a gas sample...Ch. 5 - Prob. 60ECh. 5 - Prob. 61ECh. 5 - Prob. 62ECh. 5 - Is it meaningful to say that an object at a...Ch. 5 - Prob. 64ECh. 5 - Prob. 65ECh. 5 - The pressure on a sample of hydrogen is doubled,...Ch. 5 - Prob. 67ECh. 5 - Prob. 68ECh. 5 - Prob. 69ECh. 5 - Prob. 70ECh. 5 - To what temperature must a gas sample initially at...Ch. 5 - Prob. 72ECh. 5 - Prob. 73ECh. 5 - You can safely put your hand inside a hot oven for...Ch. 5 - Prob. 75ECh. 5 - Prob. 76ECh. 5 - What is the advantage of installing the heating...Ch. 5 - Why does evaporation cool a liquid?Ch. 5 - Prob. 79ECh. 5 - Prob. 80ECh. 5 - Give as many methods as you can think of that will...Ch. 5 - How much heat is given off when 1 kg of steam at...Ch. 5 - Prob. 83ECh. 5 - Prob. 84ECh. 5 - Prob. 85ECh. 5 - Prob. 86ECh. 5 - Water at 50C can be obtained by mixing together...Ch. 5 - Prob. 88ECh. 5 - Prob. 89ECh. 5 - Prob. 90ECh. 5 - Prob. 91ECh. 5 - Is it correct to say that a refrigerator produces...Ch. 5 - Prob. 93ECh. 5 - Prob. 94ECh. 5 - An engine that operates between 2000 K and 700 K...Ch. 5 - Prob. 96ECh. 5 - Prob. 97ECh. 5 - Prob. 98ECh. 5 - Prob. 99ECh. 5 - Prob. 100E
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