Part A Review | Constants To strengthen his arm and chest muscles, a 75-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 1.15 m from the bottom of his feet, and the centers of his palms are 30.0 cm from the top of his head. 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. Figure 2.0 m F 跖 ΕΠΙ ΑΣΦ Submit Request Answer 1 of 1 Part B K30.0 cm ? N Find the force that the floor exerts on each of his hands, assuming both palms exert the same force. Express your answer in newtons. F = VO ΑΣΦ Submit Request Answer ? N

Part A Review | Constants To strengthen his arm and chest muscles, a 75-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 1.15 m from the bottom of his feet, and the centers of his palms are 30.0 cm from the top of his head. 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. Figure 2.0 m F 跖 ΕΠΙ ΑΣΦ Submit Request Answer 1 of 1 Part B K30.0 cm ? N Find the force that the floor exerts on each of his hands, assuming both palms exert the same force. Express your answer in newtons. F = VO ΑΣΦ Submit Request Answer ? N

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter12: Static Equilibrium And Elasticity

Section: Chapter Questions

Problem 37P: To get up on the roof, a person (mass 70.0 kg) places 6.00-m aluminum ladder (mass 10.0 kg) against...

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Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child pushes with a force of 17.5 N at a distance of 0.600 m from the hinges, and the second child pushes at a distance of 0.450 m. What force must the second child exert to keep the door from moving? Assume friction is negligible.
This a not graded assignment, it is a question on a practice exam. Please do question 7.
(a) What force, F, (force of reaction), should the woman in the Figure below exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed. m = 50.0 kg CG Fp 0.90 m 1.50 m W Freaction (b) The triceps muscle at the back of her upper arm has an effective lever arm of 1.75 cm, and she exerts force on the floor at a horizontal distance of 20.0 cm from the elbow joint. Calculate the magnitude of the force, F., in each triceps muscle, and compare it to her weight. (c) How much work does she do if her center of mass rises 0.240 m? (d) What is her useful power output if she does 25 pushups in one minute?
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Figure P8.27. Find the tension in each rope when a 700.-N worker stands 1.00 m from one end? e2cm lon ropes, as indicated by the blue vectors in 27. VA uniform plank of length 2.00 m and mass 30.0 ke by three ropes, as indicated by the blue vectors in supported Figure P8.27. Find the tension in each rope when a 700 N person is d = 0.500 m from the left end. er of gravig fo 12, modeling rethooran 8 B of model 10.26 T, T2 0.250 Theatthe le 40.0° lid or boln vibbud ns bano sdi svode m81 o + d » 3. 2.00 m di In bas rirob be ss gairda Figure P8.27 goil sdrto idgiod oh bail rel 2 00 bou d 28. A hungry bear weighing 700. N walks out on a heam in
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A woman doing core exercises is in a “plank position,” as shown in the diagram below. The jointwhere the spine meets the pelvis is the pivot, with the legs on one side and the upper body on theother. It is the abdominal muscles that keep the two segments from bending away from each other.The contact force at her feet is 230.0 N, and the mass of the lower segment of her body is 30.61 kg.What is the tension in her abdominal muscles that keeps her body in static equilibrium? Note:1. The object is the lower portion of the person’s body.2. The object interacts with the following things: The Earth exerts a gravitational pull (FG)verticallydownwards on this portion of their body. The feet are touching the floor, so there is a normal force(n) there. The abdominals pull (T)towards the right to balance the torques due to the other forces.This presses the pelvis into contact with the lumbar vertebrae.
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Consider the following figure. m = 50.0 kg CG 0.90 m 1.50 m reaction Fp (a) What force in newtons should the woman in the figure exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed. (b) The triceps muscle at the back of her upper arm has an effective lever arm of 1.80 cm, and she exerts force on the floor at a horizontal distance of 19.2 cm from the elbow joint. Calculate the magnitude of the force in newtons in each triceps muscle. N Compare the magnitude of the total force exerted by both triceps muscles to her weight. total force exerted by both triceps muscles her weight (c) How much work does she do in joules if her center of mass rises 0.250 m? (d) What is her useful power output in watts if she does 22 push-ups in one minute?
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