College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Chapter 9, Problem 6CQ
To determine
The stability of the pencil relative to the displacements parallel to its length.
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A uniform plank has a mass of 4.00 kg and a length of 10.0 m. A fulcrum is placed below the plank at a
position 1.00 m to the left of its center of mass.
-39,2N.m
a) Find the net torque on the plank. Include direction with cw or ccw.
b) A person has a set of masses handy: 1 kg, 2 kg, 3 kg, and 4 kg. Give at least two ways they could
place a single mass on top of the plank to put the system in equilibrium.
kg mass at a position
kg mass at a position
c) Find a way that they could place all four masses on top of the plank and have the system in rotational
equilibrium. Explain your answer / show your work:
Place a
OR
Place a
meters to the
meters to the
of the fulcrum.
of the fulcrum.
Two thin disk-shaped wheels of radii RA = 40 cm and RB = 60 cm are attached to each other on an axle that passes through the center. (see attached image)
Calculate the net torque on this compound wheel about the center due to the three forces shown assuming there is no friction at the center.
Calculate the net torque on this compound wheel about the center due to the three forces shown if there is a frictional torque of 0.05 Nm at the axle.
The disk accelerates uniformly from rest to an angular speed of 30.0 rad/s in 3.00 s. what is its angular acceleration?
The figure (a) shows an outstretched arm with
a mass of 4.2kg. The arm is 56 cm long, and
its center of gravity is 21 cm from the
shoulder. The hand at the end of the arm
holds a 6.0-kg mass. (Figure 1)
56 cm
21 en
6.0 kg
(a)
Deltoid muscle
5.0
15
18 cm
(b)
What is the torque about the shoulder due to
the weights of the arm and the 6.0-kg mass?
If the arm is held in equilibrium by the deltoid
muscle, whose force on the arm acts 5.0
degrees below the horizontal at a point 18
cm from the shoulder joint (the figure (b)),
what is the force exerted by the muscle?
Chapter 9 Solutions
College Physics
Ch. 9 - What can you say about the velocity of a moving...Ch. 9 - Under what conditions can a rotating body be in...Ch. 9 - What three factors affect the torque created by a...Ch. 9 - A wrecking ball is being used to knock down a...Ch. 9 - Mechanics put a length of Pipe over the handle of...Ch. 9 - Prob. 6CQCh. 9 - Explain the need for tall towers on a suspension...Ch. 9 - When visiting some countries, you may see a person...Ch. 9 - Prob. 9CQCh. 9 - Prob. 10CQ
Ch. 9 - Why are the forces exerted on the outside world by...Ch. 9 - Explain why the forces in our joints are several...Ch. 9 - Why are the forces exerted on the outside world by...Ch. 9 - Explain why the forces in our joints are several...Ch. 9 - Certain of dinosaurs were bipedal (walked on two...Ch. 9 - Swimmers and athletes during competition need to...Ch. 9 - If the maximum force the biceps muscle can exert...Ch. 9 - Suppose the biceps muscle was attached through...Ch. 9 - Explain one of the reasons why pregnant women...Ch. 9 - (a) When opening a door, you push on it...Ch. 9 - When tightening a bolt, you push perpendicularly...Ch. 9 - Two children push on opposite sides of a door...Ch. 9 - Use the second condition for equilibrium (net =0 )...Ch. 9 - Repeat the seesaw problem in Example 9.1 with the...Ch. 9 - Prob. 6PECh. 9 - Two children of mass 20.0 kg and 30.0 kg sit...Ch. 9 - Prob. 8PECh. 9 - A person carries a plank of wood 2.00 m long with...Ch. 9 - Prob. 10PECh. 9 - Prob. 11PECh. 9 - Prob. 12PECh. 9 - Prob. 13PECh. 9 - Prob. 14PECh. 9 - Prob. 15PECh. 9 - Prob. 16PECh. 9 - To get up on the roof, a person (mass 70.0 kg)...Ch. 9 - Prob. 18PECh. 9 - Prob. 19PECh. 9 - Suppose you needed to raise a 250-kg mower a...Ch. 9 - Prob. 21PECh. 9 - Prob. 22PECh. 9 - Prob. 23PECh. 9 - Prob. 24PECh. 9 - Prob. 25PECh. 9 - Prob. 26PECh. 9 - Prob. 27PECh. 9 - Prob. 28PECh. 9 - Prob. 29PECh. 9 - Prob. 30PECh. 9 - Prob. 31PECh. 9 - Prob. 32PECh. 9 - Prob. 33PECh. 9 - Prob. 34PECh. 9 - Prob. 35PECh. 9 - Integrated Concepts Suppose we replace the 4.0-kg...Ch. 9 - Prob. 37PECh. 9 - You have just planted a sturdy 2-m-tall palm tree...Ch. 9 - Unreasonable Results Suppose two children are...Ch. 9 - Construct Your Own Problem Consider a method for...Ch. 9 - Prob. 1TPCh. 9 - Prob. 2TPCh. 9 - Prob. 3TPCh. 9 - Prob. 4TPCh. 9 - Prob. 5TPCh. 9 - Prob. 6TPCh. 9 - Prob. 7TPCh. 9 - Prob. 8TPCh. 9 - Prob. 9TPCh. 9 - Prob. 10TPCh. 9 - Prob. 11TP
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