College Physics (10th Edition)
10th Edition
ISBN: 9780321902788
Author: Hugh D. Young, Philip W. Adams, Raymond Joseph Chastain
Publisher: PEARSON
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Chapter 10, Problem 38P
To determine
The force exerts on each feet and hands of the athlete.
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E Boview
Find the force that the floor exerts on each of his feet, assuming that both feet exert the same force.
To strengthen his arm and chest muscles, a 79-kg
athlete 2.0 m tall is doing a series of push-ups as shown
in the figure below (Figure 1). His center of mass is
1.20 m from the bottom of his feet, and the centers of his
palms are 30.0 cm from the top of his head.
Express your answerkn newtons.
F- 125.24
Submit Previou Answers Reguest Answer
X Incorrect; Try Again; 4 attempts remaining
Part B
Figure
1 of 1>
Find the force that the floor exerts on each of his hands, assuming both palms exert the same force.
Express your answer in newtons.
-20m
F- 114
-300 on
Submit
Previous Answers Bequest Answer
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P Pearson
Bugs Bunny, during his training for the Space Jam sequel, is trying to perform a biceps curl and is attempting to lift a 150 N dumbbell. The moment arm of this weight about his elbow joint is 25 cm. The force created by the elbow flexor muscles is 2000 N. The moment arm of the elbow flexor muscles is 2 cm. Is Bugs able to lift the weight with this amount of force in his flexor muscles?
A 75.0 kg weight lifter is doing arm raises using a 7.50 kg weight in her hand. Her arm pivots around the elbow joint, starting 40.0 ∘ below the horizontal. (See (Figure 1).) Biometric measurements have shown that both forearms and the hands together account for 6.30 % of a person's weight. Since the upper arm is held vertically, the biceps muscle always acts vertically and is attached to the bones of the forearm 5.50 cm from the elbow joint. The center of mass of this person's forearm-hand combination is 18.5 cm from the elbow joint, along the bones of the forearm, and the weight is held 38.0 cm from the elbow joint.
What force does the biceps muscle exert on the forearm?
Find the magnitude of the force that the elbow joint exerts on the forearm.
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...
Ch. 10 - Global warming. As the earths climate continues to...Ch. 10 - If two spinning objects have the same angular...Ch. 10 - You are designing a wheel that must have a fixed...Ch. 10 - Prob. 2MCPCh. 10 - A student is sitting on a frictionless rotating...Ch. 10 - If the torques on an object balance, then it...Ch. 10 - If the forces on an object balance, then it...Ch. 10 - Prob. 6MCPCh. 10 - A person pushes vertically downward with force P...Ch. 10 - String is wrapped around the outer rim of a solid...Ch. 10 - A ball of mass 0.20 kg is whirled in a horizontal...Ch. 10 - A heavy solid disk rotating freely and slowed only...Ch. 10 - A uniform metal meterstick is balanced as shown in...Ch. 10 - Prob. 1PCh. 10 - Calculate the net torque about point O for the two...Ch. 10 - Three forces are applied to a wheel of radius...Ch. 10 - A 4 N and a 10 N force act on an object. The...Ch. 10 - A square metal plate 0.180 m on each side is...Ch. 10 - A cord is wrapped around the rim of a wheel 0.250...Ch. 10 - A certain type of propeller blade can be modeled...Ch. 10 - A 750 g grinding wheel 25.0 cm in diameter is in...Ch. 10 - A grindstone in the shape of a solid disk with...Ch. 10 - A solid, uniform cylinder with mass 8.00 kg and...Ch. 10 - A 2.00 kg stone is tied to a thin, light wire...Ch. 10 - A light rope is wrapped several times around a...Ch. 10 - A thin, light string is wrapped around the rim of...Ch. 10 - 14. A uniform, 8.40-kg, spherical shell 50.0 cm in...Ch. 10 - A hollow spherical shell with mass 2.00 kg rolls...Ch. 10 - A solid disk of radius 8.50 cm and mass 1.25 kg,...Ch. 10 - What is the power output in horsepower of an...Ch. 10 - A solid uniform sphere of mass 5 kg and radius 0.1...Ch. 10 - A playground merry-go-round has a radius of 4.40 m...Ch. 10 - The flywheel of a motor has a mass of 300.0 kg and...Ch. 10 - Calculate the angular momentum and kinetic energy...Ch. 10 - (a) Calculate the magnitude of the angular...Ch. 10 - A small 0.300 kg bird is flying horizontally at...Ch. 10 - A. small 4.0 kg brick is released from rest 2.5 m...Ch. 10 - The London Eye is the tallest Ferris wheel in...Ch. 10 - A certain drawbridge can be modeled as a uniform...Ch. 10 - On an old-fashioned rotating piano stool, a woman...Ch. 10 - The spinning figure skater. The outstretched hands...Ch. 10 - A small block on a frictionless horizontal surface...Ch. 10 - A uniform 2 kg solid disk of radius R 0.4 m is...Ch. 10 - A diver comes off a board with arms straight up...Ch. 10 - A large turntable rotates about a fixed vertical...Ch. 10 - A large wooden turntable in the shape of a flat...Ch. 10 - Which of the objects shown in Figure 10.55 are in...Ch. 10 - (a) In each of the objects in Figure 10.56, what...Ch. 10 - Prob. 36PCh. 10 - Prob. 37PCh. 10 - Prob. 38PCh. 10 - Prob. 39PCh. 10 - Prob. 40PCh. 10 - The horizontal beam in Figure 10.60 weighs 150 N,...Ch. 10 - The boom in Figure 10.61 weighs 2600 N and is...Ch. 10 - A uniform ladder 7.0 m long weighing 450 N rests...Ch. 10 - A 9.0 m uniform beam is hinged to a vertical wall...Ch. 10 - A uniform beam 4.0 m long and weighing 2500 N...Ch. 10 - A diving board 3.00 m long is supported at a point...Ch. 10 - Two people carry a heavy electric motor by placing...Ch. 10 - Pumping iron. A 72.0 kg weightlifter is doing arm...Ch. 10 - The deltoid muscle. The deltoid muscle is the main...Ch. 10 - The rotor (flywheel) of a toy gyroscope has a mass...Ch. 10 - For each of the following rotating objects,...Ch. 10 - Prob. 52GPCh. 10 - A good workout. You are doing exercises on a...Ch. 10 - Prior to being placed in its hole, a 5700 N,...Ch. 10 - Prob. 55GPCh. 10 - One end of a 1.2-m-long beam is hinged to a...Ch. 10 - The farmyard gate. A gate 4.00 m wide and 2.00 m...Ch. 10 - 58. Atwoods machine. Figure 10.72 illustrates an...Ch. 10 - Prob. 59GPCh. 10 - The forces on the foot. A 750 N athlete standing...Ch. 10 - A uniform solid cylinder of mass M is supported on...Ch. 10 - Prob. 62GPCh. 10 - You are trying to raise a bicycle wheel of mass m...Ch. 10 - An experimental bicycle wheel is placed on a test...Ch. 10 - Prob. 65GPCh. 10 - Disks A and B are mounted on shaft SS and may be...Ch. 10 - One end of a thin, uniform rod is connected to a...Ch. 10 - A uniform, 7.5-m-long beam weighing 9000 N is...Ch. 10 - Human moment of inertia. The moment of inertia of...Ch. 10 - While the turntable is being accelerated, the...Ch. 10 - A doubling of the torque produces a greater...Ch. 10 - If the bodys center of mass were not placed on the...Ch. 10 - Torques and tug-of-war. In a study of the...Ch. 10 - If the competitor leans slightly farther back...Ch. 10 - Torques and tug-of-war. In a study of the...
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- To strengthen his arm and chest muscles, a 79-kg athlete 2.0 m tall is doing a series of push-ups as shown in the figure below (Eigure 1). His center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0 cm from the top of his head. Figure -2.0m 1 of 1 30.0 cm Find the force that the floor exerts on each of his feet, assuming that both feet exert the same force. Express your answer in newtons. F= Submit Part B F= [5] ΑΣΦ Submit Request Answer Find the force that the floor exerts on each of his hands, assuming both palms exert the same force. Express your answer in newtons. 1971 ΑΣΦ Request Answer ? N Narrow_forwardA physics student is getting some physical education, specifically doing a pushup, sohe’s supported by his feet and by his hands directly below his shoulders. At the bottomof the pushup, when his body is level, his center of mass is 39 cm from his shoulders and99 cm from his feet, and his mass is 75 kg. Find the force on his hands and the force onhis feet.arrow_forwardTo strengthen his arm and chest muscles, a 79-kg athlete 2.0 m tall is doing a series of push-ups as shown in the figure below (Figure 1). His center of mass is 1.20 m from the bottom of his feet, and the centers of his palms are 30.0 cm from the top of his head. Figure 1 of 1 > 20m -300 Review Find the force that the floor exerts on each of his feet, assuming that both feet exert the same force. Express your answerin newtons. 16] ΑΣΦ ? F-125.24 Submit Previous Answers Request Answer * Incorrect; Try Again; 4 attempts remaining Part B Find the force that the floor exerts on each of his hands, assuming both palms exert the same force. Express your answer in newtons. LIVE ΑΣΦΑ F-114 N Submit Previous Answers Request Answer * Incorrect; Try Again; 5 attempts remaining P Pearson Narrow_forward
- 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?arrow_forwardProblem 7.07. To do a push-up, Alice must exert a force with her arms against her center of gravity. If Alice has a mass of 55.3 kg and center of gravity is 1.00 m from her feet, what force must her arms, which are 1.65 m from her feet, exert to perform a controlled push-up at a constant velocity?arrow_forwardThe forces exerted by the bicep muscle and acting on the elbow when a 12 kg barbell is being curled can be modeled based on the diagram above. The bicep muscle can be treated as a vertical cable. The mass and length of the forearm are 2 kg and 32 cm, respectively. The center of mass of the forearm is a distance of 14 cm from the point P, while the bicep connects to the forearm at a point 4.5 cm from P. a) Determine the tension in bicep muscle and the force of the humerus acting downward on the elbow at point P. b) Assuming the tension in the bicep muscle continues to be oriented vertically, determine the tension in the bicep muscle and the force acting at P after the barbell has been raised by an angle of 30 degrees relative to the horizontal.arrow_forward
- The forearm shown below is positioned at an angle with respect to the upper arm, and a 5.6 kg mass is held in the hand. The total mass of the forearm and hand is 2.1 kg, and their center of mass is 16.1 cm from the elbow. (Assume the biceps muscle exerts a force on the forearm that acts vertically.) 5.6 kg B 37.5 cm 4.0 cm (a) What is the magnitude of the force (in N) that the biceps muscle exerts on the forearm for 0-60%7 N (b) What is the magnitude of the force on the elbow joint (in N) for the same angle? N (c) How do these forces depend on the angle 07 The force that the biceps muscle exerts increases and the force on the elbow joint decreases as increases. They both decrease as @ increases. They both increase as increases. They do not depend on 0. The force that the biceps muscle exerts decreases and the force on the elbow joint increases as increases.arrow_forwardBig Sister and Little Brother are balanced on a see-saw. Big Sister sits a distance of 1.13m away from the center of the see-saw and Little Brother sits a distance of 1.97m away from the center of the see-saw. The total mass of the two children is 57.0kg. Little Brother has a mass of_ kg.arrow_forwardAn architecture student working at a drafting table requires some muscle action in order to support her head. As shown in the figure, three forces act on her head. If the force provided by muscles is FM = 75 N and the weight of her head is W = 38 N, determine the magnitude and direction of the force provided by the upper vertebrae F, to hold her head stationary. Assume that this force acts along a line through the center of mass of her head as do the weight and muscle force. (Assume the +x-axis to be to the right.) magnitude N direction ° measured clockwise from the -x-axis F,arrow_forward
- An 85-kg basketball player does a series of push-ups to strengthen his arm and chest muscles. If both feet and exert the same force and both palms do, likewise, determine the force that the floor exerts of on each of his feet and on each hand. Assume that his center of mass is 0.920 m from the top of his head.arrow_forwardA 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?arrow_forwardConsider a horizontal forearm. On one end of the forearm is the elbow, and on the other end is the hand. The forearm has a mass of 2.08 kg. The distance from the elbow to the hand is 39.7 cm. If the biceps muscle connects to the forearm a distance of 4.73 cm from the elbow, and the biceps muscle can supply a maximum force of 1.417E+3 N (with the forearm in a horizontal position), what is the maximum mass (in kg) that the person can hold?arrow_forward
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