College Physics (10th Edition)
10th Edition
ISBN: 9780321902788
Author: Hugh D. Young, Philip W. Adams, Raymond Joseph Chastain
Publisher: PEARSON
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Question
Chapter 10, Problem 39P
(a)
To determine
Sketch the free body diagram of motor.
(b)
To determine
Weight of the motor.
(a)
To determine
Distance at which centre of gravity is located.
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A 50 N hand and forearm are held at a 35° angle to the vertically oriented humerus. The CG of the forearm and hand is located at a distance of 12.5 cm from the joint center at the elbow, and the elbow flexor muscles attach at an average distance of 2.5 cm from the joint center. (Assume that the muscles attach at an angle of 35° to the forearm bones.) How much force must be exerted by the forearm flexors to maintain this position?
A hungry 800-N bear walks out on a beam in an attempt to retrieve some "goodies" hanging at the end. The beam is uniform, weighs 200 N, and is 6.00 m long; the goodies weigh 85.0 N.
60.0°
Goodies
(a) Draw a free-body diagram of the beam. (Do this on paper. Your instructor may ask you to turn in this sketch.)
(b) When the bear is at x = 1.00 m, find the tension in the wire and the components of the reaction force at the hinge.
N (tension)
N (horizontal reaction)
N (vertical reaction)
(c) If the wire can withstand a maximum tension of 870 N, what is the maximum distance the bear can walk before the wire breaks?
m
A 50 N hand and forearm are held at a 35° angle to the vertically oriented humerus. The CG of the forearm and hand is located at a distance of 12.5 cm from the joint center at the elbow, and the elbow flexor muscles attach at an average distance of 2.5 cm from the joint center. (Assume that the muscles attach at an angle of 35° to the forearm bones.)
How much force must the forearm flexors exert if a 50 N weight is held in the hand at a distance along the arm of 25 cm?
Chapter 10 Solutions
College Physics (10th Edition)
Ch. 10 - When tightening a bolt, mechanics sometimes extend...Ch. 10 - Prob. 2CQCh. 10 - Two identical uniform 30 cm bricks are placed one...Ch. 10 - (a) If the forces on an object balance, do the...Ch. 10 - (a) Can you change the location of your bodys...Ch. 10 - Serious bicyclists say that if you reduce the...Ch. 10 - Prob. 7CQCh. 10 - In terms of torques, discuss the action of a claw...Ch. 10 - Why is a tapered water glass with a narrow base...Ch. 10 - True or false? In picking an axis about which to...
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