Problem 1: Even when the head is held erect, as shown in the figure, its center of mass is not directly over the principal point of support (the atlanto-occipital joint). The muscles at the back of the neck should therefore exert a force o keep the head erect. That is why your head falls forward when you fall asleep in class. 5.0 cm F CG 2.5 cm

Problem 1: Even when the head is held erect, as shown in the figure, its center of mass is not directly over the principal point of support (the atlanto-occipital joint). The muscles at the back of the neck should therefore exert a force o keep the head erect. That is why your head falls forward when you fall asleep in class. 5.0 cm F CG 2.5 cm

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter9: Statics And Torque

Section: Chapter Questions

Problem 37PE: (a) What force should the woman in Figure 9.45 exert on the floor with each hand to do a push-up?...

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(a) What force should the woman in Figure 9.45 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 1.75 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 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?
Torque and the Two Conditions for Equilibrium 17. The arm in Figure P8.17 weighs 41.5 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force Ft, in the deltoid muscle and the force Fs exerted by the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown. Figure P8.17
Even when the head is held erect, as shown in the figure, its center of mass is not directly over the principal point of support (the atlanto-occipital joint, Point A). The muscles at the back of the neck should, therefore, exert a force to keep the head erect. That is why your head falls forward when you fall asleep in the class. F If the head weighs 51 N, calculate the force exerted by the muscles FM using the information in the figure. Assume that X1 = 5.3 cm, X2 = 2.5 cm, and JFw|=SIN.
A person places his hand palm downward on a scale and pushes down on the scale until it reads 96.0 N. The triceps muscle is responsible for this arm extension force. Find the force exerted by the triceps muscle. The bottom of the triceps muscle is 2.50 cm to the left of the elbow joint, and the palm is pushing at approximately 29.0 cm to the right of the elbow joint. P 96.0 N 2.50 cm and Q = 29.0 cm. where P =
If you hold your arm outstretched with palm upward, as shown, the force to keep your arm from falling comes from your deltoid muscle. The arm of a typical person has mass 4.0 kg and the distances and angles shown in the figure.a. What force must the deltoid muscle provide to keep the arm in this position?b. By what factor does this force exceed the weight of the arm?
Even when the head is held erect, as shown in the figure, its center of mass is not directly over the principal point of support (the atlanto-occipital joint, Point A). The muscles at the back of the neck should, therefore, exert a force to keep the head erect. That is why your head falls forward when you fall asleep in the class. If the head weighs 55 N, calculate the force exerted by the muscles ?M using the information in the figure. Assume that ?1=5.3 cm, ?2=2.5 cm, and ∣∣?⃗ w∣∣=55 N. What is the force FJ exerted by the pivot on the head?
6. If you hold your arm outstretched with palm upward, as in the figure, the force to keep your arm from falling comes from your deltoid muscle. The arm of a typical person has mass 4.0 kg and the distances and angles shown in the Figure. a. What force must the deltoid muscle provide to keep the arm in this position? b. By what factor does this force exceed the weight of the arm? 15° Deltoid |17 cm 38 cm O 2019 Pearson Education, Inc.
⦁ Imagine that you hold a 6.0kg lead ball in your hand with your arm bent. The ball is 0.35m from the elbow joint. The biceps muscle attaches to the forearm 0.050m from the elbow joint and exerts a force on the forearm that allows it to support the ball. The center of mass of the 12N forearm is 0.16m from the elbow joint. Estimate the magnitude of⦁ The force that the biceps muscle exerts on the forearm ⦁ The force that the upper arm exerts on the forearm at the elbow
Figure FM 15° 12 cm- 24 cm- mg < 1 of 1 Calculate the magnitude of the force, FM, required of the "deltoid" muscle to hold up the outstretched arm shown in the figure. (Figure 1) The total mass of the arm is 3.3 kg Express your answer to two significant figures and include the appropriate units. μÃ FM = Submit Part B F₁ = X Incorrect; Try Again; 5 attempts remaining Submit Value Part C Calculate the magnitude of the force F exerted by the shoulder joint on the upper arm. Express your answer to two significant figures and include the appropriate units. Previous Answers Request Answer 0₁ = N Value Request Answer ? Units Calculate the angle (to the horizontal) at which the force Facts. Express your answer in degrees using two significant figures. G|| ΑΣΦ Doorco ? ? below the horizontal
Even when the head is held erect, as in Figure shown, its center of mass is not directly over the principal point of support (the atlanto-occipital joint). The muscles at the back of the neck should therefore exert a force to keep the head erect. That is why your head falls forward when you fall asleep in the class. Calculate the force exerted by these muscles using the information in the figure.
In exercise physiology studies, it is sometimes important to determine the location of a person's center of gravity. This can be done with the arrangement shown in the figure below. 2.00 m Fg2 g1 A light plank rests on two scales that read F = 390 N and F g1 = 300 N. The scales are separated by a distance of 2.00 m. How far from the woman's feet is her center of g2 gravity? 1.08 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. m
To pull with a force F=172 N on the scale as shown, what should the tension in your biceps muscle be? The distance h = 0.30 m. magnitude Direction