Due to a jaw injury, a patient must wear a strap (see the figure) that produces a net upward force of 5.00 N on his chin. The tension is the same throughout the strap.
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Due to a jaw injury, a patient must wear a strap (see the figure) that produces a net upward force of 5.00 N on his chin. The tension is the same throughout the strap.
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- A 20.0-kg horizontal plank 4.00 in long rests on two supports, one at the left end and a second 1.00 m from the right end. What is the magnitude of the force exerted on the plank by the support near the right end? (a) 32.0 N (b) 45.2 N (c) 112 N (d) 131 N (e) 98.2 NThe drawing below shows a person whose weight is W = 603 N doing push-ups. Assume L1 = 0.880 m and L2 = 0.435 m. Calculate the normal force exerted by the floor on each hand, assuming that the person holds this position.A toddler weighs 10 kg and raises herself onto tiptoe (on both feet). Her feet are 8 cm long with each ankle joint being located 4.5 cm from the point at which her feet contact the floor. While standing on tip toe: (a) what is the upward normal force exerted by the floor at the point at which one of the toddler’s feet contacts the floor? (b) what is the tension force in one of her Achilles tendons? (c) what is the downward force exerted on one of the toddler’s ankle joints?
- Consider the following figure. (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. N (b) The triceps muscle at the back of her upper arm has an effective lever arm of 1.76 cm, and she exerts force on the floor at a horizontal distance of 19.6 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 0.230 m? J (d) What is her useful power output in watts if she does 26 push-ups in one minute? WA bodybuilder holds a dumbbell of weight Wd. His arm is horizontal and weighs 47 N. The deltoid muscle is assumed to be the only muscle acting and is attached to the arm as shown. The maximum force M that the deltoid muscle can supply has a magnitude of 2481 N. The distances that locate where the various forces act on the arm. What is the weight of the heaviest dumbbell that can be held by the bodybuilder? Note: Express your answer in whole numbers. No unit is required for the final answer. M. ... r13.0° +y Wa 0.150 m 0.280 m +T 0.620 m (b) Free-body diagram of the arm M Deltoid Dumbbell 13.0 muscle Axis Shoulder joint (a) (c)Hazel stands on the edge of a lookout admiring the view of a waterfall. The lookout is supported by a horizontal cantilever beam of length 4.5 m. Hazel's mass is 60 kg 4.5 m What is the upward force on the beam? Use g = 9.81 m/s2 for the acceleration due to gravity.
- A 300 N girl and a 400 N boy stand on a 16-m platform supported by posts A and B as shown, The platform itself weighs 200 N. What are the forces exerted by the supports on the platform? Draw a free body diagram.Unlike most of the other muscles in our bodies, the masseter muscle in the jaw, as illustrated in the figure, is attached relatively far from the joint, enabling very large forces to be exerted by the back teeth. This is shown in the figure below, where a person is biting down on a bullet placed between the back teeth. (FM= 210 N and rR = 4.1 cm.) (a) Using the information in the figure, calculate the magnitude of the force exerted by the teeth on the bullet. (b) Calculate magnitude of the force on the joint.A window washer is standing on a scaffold supported by a vertical rope at each end. The scaffold weighs 204 N and is 3.2 m long. What is the tension in each rope when the 698-N worker stands 1.06 m from one end? smaller tension N N larger tension
- When a gymnast performing on the rings executes the iron cross, he maintains the position at rest shown in the figure at the top. In this maneuver, the gymnast's feet (not shown) are off the floor. The primary muscles involved in supporting this position are the latissimus dorsi ("lats") and the pectoralis major ("pecs"). One of the rings exerts an upward force F½ on a hand as shown in the figure at the bottom. The force F¸ is exerted by the shoulder joint on the arm. The latissimus dorsi and pectoralis major muscles exert a total force Fm on the arm. Ed Bock/CORBIS Shoulder joint 4.00 cm- F π/4 F 70.0 cm (a) Using the information in the figure, find the magnitude of the force Fm. (Use only scalar quantities, i.e. Få for Ƒn| entered in meters, but do not include the units themselves. Any angles should be entered in radians, not degrees.) Fh = Fmcos(x) and Fs for Fs. Use any variable or symbol stated above as necessary. Any lengths should beA window washer is standing on a scaffold supported by a vertical rope at each end. The scaffold weighs 192 N and is 3.1 m long. What is the tension in each rope when the 710–N worker stands 1.06 m from one end? Smaller tension? Larger tension?A 5-m-long simply supported timber beam carries two concentrated loads as shown. If L = 6 kN and M = 54 kN, determine the magnitude of the vertical force acting at support D. y 2 m O 42.9 KN O 63.4 kN 45.6 KN O 53.5 kN O 33.6 KN L B 2 m M a 1 m 0.5 m D X
