Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 12, Problem 8P
To determine
To Explain:The purpose of the technique hiking out.
The way, the sailors would keep their craft stable if the wind were stronger.
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Biomechanically, what is the significance and importance of the center of gravity when performing a kick out exercise?
Stand with your heels and back against a wall and try to bend over and touch your toes. You’ll find that you have to stand away from the wall to do so without toppling over. Compare the minimum distance of your heels from the wall with that of a friend of the opposite sex. Who can touch their toes with their heels nearer to the wall males or females? On the average and in proportion to height, which sex has the lower center of gravity?
Stand with your heels and back against a wall and try to bend over and touch your toes. You’ll find that you have to stand away from the wall to do so without toppling over. Compare the minimum distance of your heels from the wall with the distance for a friend of the opposite sex. Who can touch their toes with their heels nearer to the wall: men or women? On the average and in proportion to height, which sex has the lower center of gravity?
Chapter 12 Solutions
Physics for Scientists and Engineers
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- You can find the center of gravity of a long ruler by resting it horizontally on your two index fingers, and then slowly drawing your fingers together. First the ruler will slip on one finger, and then on the other, but eventually the fingers meet at the CG. Why does this workarrow_forwardWhy can’t you put your heels firmly against a wall and then bend over without falling?arrow_forwardYou can find the center of gravity of a meter stick by resting it horizontally on your two index fingers, and then slowly drawing your fingers together. First the meter stick will slip on one finger, and then on the other, but eventually the fingers meet at the CG. Why does this work?arrow_forward
- In order to get his car out of the mud, a man ties one end of a rope to the front bumper and the other end to a tree 15 m away, as shown below. He then pulls on the center of the rope with a force of 400 N, which causes its center to be displaced 0.30 m, as shown. What is the force of the rope on the car?arrow_forwardActivity: Stand straight with your heels, back, and head against a wall. Bend forward from your waist, keeping your heels and Bottom against the wall, to touch your toes. Can you do this without toppling over? Explain why and what you need to do to be able to touch your toes without losing your balance. Is it easier for a woman to do this?arrow_forwardWhen you turn while running, you must lean in the direction of the turn or risk falling over. If you lean left as you turn left, why don’t you fall over to the left?arrow_forward
- MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Consider the following mass distribution where the x- and y-coordinates are given in meters: 5.0 kg at (0.0, 0.0) m, 3.6 kg at (0.0, 4.1) m, and 4.0 kg at (2.9, 0.0) m. Where should a fourth object of 7.4 kg be placed so that the center of gravity of the four-object arrangement will be at (0.0, 0.0) m? x = m Need Help? Read It Watch Itarrow_forwardA person bending forward to lift a load "with his back" (Figure a) rather than with his knees" can be injured by large forces exerted on the muscles and vertebrae. 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, and to understand why back problems are common among humans, consider the model shown in Figure b, of a person bending forward to lift a W-195-N object. The spine and upper body are represented as a uniform horizontal rod of weight W-295 N pivoted at the base of the spine. The erector spinalls 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 12.0° Back muscle Pivot R₂ T120 T W W₂ 0 (a) Find the tension in the back muscle. KN D (b) Find the compressional force in the spine. (Enter the magnitude.) KNarrow_forwardB 30° A The 50 kg homogeneous smooth sphere rests on the 30 degree incline A and bears against the smooth vertical wall B. Determine: Magnitude of Contact force at A (in N) round off to two (2) decimal places answer range: +/- 0.05 unitsarrow_forward
- The truck tips when the angle is 14°. Determine the height of the center of mass, h.(include units with answer)arrow_forwardDA man holds a 178-N ball in his hand, with the arm bone- 22. Upper - rlexor muscle forcarm horizontal (sce the draw- ing). He can support the ball in this position because of the flexor muscle force M, which is applied perpendicular to the forearm. The forearm weighs 22.0 N and has a center of gravity as indicated. Find (a) the magnitude of M and (b) the magnitude and direction of the force applied by the upper arm bone to the forearm at the elbow joint. Elbow cg joint '0.0890 m -0.330 m- 0.0510 marrow_forwardCalculate the horizontal force P on the light 15° wedge necessary to initiate movement of the 59-kg cylinder. The coefficient of static friction for both pairs of contacting surfaces is 0.39. Also determine the friction force FB at point B. (Caution: Check carefully your assumption of where slipping occurs.) P Answers: P= i FB = i 59 kg B N Narrow_forward
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