COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 8, Problem 78QAP
To determine
The torque about your shoulder axis if you hold a
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after the brake is applied, what is
the magnitude of the torque exerted
by the brake? Example 8-12.
86. A solid cylindrical pulley
with a mass of 1.00 kg and a radius
of 0.25 m is free to rotate about its
axis. An object of mass 0.250 kg is
attached to the pulley with a light
string (Figure 8-55). Assuming the
string does not stretch or slip, calcu-
late the tension in the string and the
angular acceleration of the pulley. Figure 8-55 Problem 86
Example 8-13
91.
a th
anc
92.
wh
rac
93
it c
the
th
94
cm
46.. A torque wrench is used to tighten a nut on a bolt. The wrench is 25
long, and a force of 120 N is applied at the end of the wrench as shown in Figure
9-42. Calculate the torque about the axis that passes through the bolt. Example
9-3
F = 120 N
20%
Figure 9-42 Problem 46
25 cm
Freedman, College Physics,
3e, 2021 W. H. Freeman
and Company
When the bar is subjected to the torque T, which of the following statement is true about its length L?
L shortens
L remains unchanged
None of the rest
L elongates
Chapter 8 Solutions
COLLEGE PHYSICS
Ch. 8 - Prob. 1QAPCh. 8 - Prob. 2QAPCh. 8 - Prob. 3QAPCh. 8 - Prob. 4QAPCh. 8 - Prob. 5QAPCh. 8 - Prob. 6QAPCh. 8 - Prob. 7QAPCh. 8 - Prob. 8QAPCh. 8 - Prob. 9QAPCh. 8 - Prob. 10QAP
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- Consider the downhill race in Example 13.9 (page 372). The acceleration of a particle down an incline is aparticle = g sin ,where is the angle the incline makes with the horizontal.Show that the acceleration of a rolling object down an incline isgiven by aCM=aparticale1+farrow_forwardAn automobile engine can produce 200Nm of torque. Calculate the angular acceleration produced if 95.0 of this torque is applied to the drive shaft, axle, and rear wheels of a car, given the following information. The car is suspended so that the wheels can turn freely. Each wheel acts like a 15.0-kg disk that has a 0.180-m radius. The walls of each tire act like a 2.00-kg annular ring that has inside radius of 0.180 m and outside radius of 0.320 m. The tread of each tire acts like a 10.0-kg hoop of radius 0.330 m. The 14.0-kg axle acts like a rod that has a 2.00-cm radius. The 30.0-kg drive shaft acts like a rod that has a 3.20-cm radius.arrow_forwardIn analyzing the equilibrium of a flat, rigid object, you are about to choose an axis about which you will calculate torques. Which of the following describes the choice you should make? (a) The axis should pass through the objects center of mass. (b) The axis should pass through one end of the object. (c) The axis should be either the x axis or the y axis. (d) The axis should pass through any point within the object. (e) Any axis within or outside the object can be chosen.arrow_forward
- An automobile engine can produce 200 N m of torque. Calculate the angular acceleration produced if 95.0% of this torque is applied to the drive shaft, axle, and rear wheels of a car, given the following information. The car is suspended so that the wheels can turn freely. Each wheel acts like a 15.0 kg disk that has a 0.180 m radius. The walls of each tire act like a 2.00-kg annular ring that has inside radius of 0.180 m and outside radius of 0.320 m. The tread of each tire acts like a 10.0-kg hoop of radius 0.330 m. The 14.0-kg axle acts like a rod that has a 2.00-cm radius. The 30.0-kg drive shaft acts like a rod that has a 3.20-cm radius.arrow_forwardRotational Inertia Problems 5 and 6 are paired. 5. N A system consists of four boxes modeled as particles connected by very lightweight, stiff rods (Fig. P13.5). The system rotates around the z axis, which points out of the page. Each particle has a mass of 5.00 kg. The distances from the z axis to each particle are r1 = 32.0 cm, r2 = 16.0 cm, r3 = 17.0 cm, and r4 = 34.0 cm. Find the rotational inertia of the system around the z axis. 6. N Use the information in Problem 5 to find the rotational inertia of the system around particle 1. FIGURE P13.5 Problems 5 and 6.arrow_forwardProblems 11 and 12 are paired. A thin disk of radius R has a nonuniform density = 4.5r2, when r is in meters. Derive an expression for the rotational inertia of this disk around an axis through its center and perpendicular to the disks surface, assuming R is given in meters.arrow_forward
- Determine the magnitude of the torque exerted about point P by m1 m2 m3arrow_forward24 - A force F =( 2 i +3 j ) N acts on a body that can rotate about a fixed axis along the z-coordinate axis. If the force is applied to the point r= ( 4 i +5 j ) meters, what will be the direction of the torque? A) in the l direction B) Between k and j unit vector C) Between the unit vector i and j D) Between i and k unit vector E) in the k directionarrow_forward77. . A uniform, solid sphere of radius 5.00 cm and mass 3.00 kg starts with a translational speed of 2.00 m/s at the top of an inclined plane that is 2.00 m long and tilted at an angle of 25.0° with the horizontal and rolls without slipping down the ramp. What is the sphere's speed at the bottom of the ramp? Example 9-13arrow_forward
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