EBK PHYSICS FOR SCIENTISTS AND ENGINEER
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
6th Edition
ISBN: 9781319321710
Author: Mosca
Publisher: VST
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Chapter 12, Problem 57P
To determine

To Find:The values of unknown masses of objects.

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A UNIFORM ROD OF LENGTH 3M AND WEIGHT 100N, WITH ENDS A ANDB RESTING ON TWO BRACKETS, BEARS 5ØN WEIGHT 0.5M FROM END A AND 150N WEIGHT 2M FROM FIRST WEIGHT. FIND THE REACTION FORCES AT B AND A. FB FA A
The rigid arm of negligible weight shown in the figure supports a load of F-901 N. The chains are fixed to the wall at points DvE and support A is of the bal-and socket type (spherical). Find the Magnitude of the Fed Force X₂-3 m y 6m 2-5m E X2 F
Assume a person bends forward to lift a load "with his back" as shown in Figure (a). The spine pivots mainly at the fifth lumbar vertebra, with the principal supporting force provided by the erector spinalis muscle in the back. To see the magnitude of the forces involved, consider the model shown in Figure (b) for a person bending forward to lift a W, = 205-N object. The spine and upper body are represented as a uniform horizontal rod of weight W, = 320 N, pivoted at the base of the spine. The erector spinalis muscle, attached at a point two-thirds of the way up the spine, maintains the position of the back. The angle between the spine and this muscle is 0 = 10.5°. Back muscle R, Pivot R W2 a (a) Find the tension T in the back muscle. N (b) Find the compressional force in the spine. (c) Is this method a good way to lift a load? O Yes No Explain your answer, using the results of parts, using the results of parts (a) and (b). This answer has not been graded yet. (d) Can you suggest a…
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