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 F, in the deltoid muscle and the force F, exerted by the shoulder on the humerus (upper- arm bone) to hold the arm in the position shown. F, 12° F, '0.080 m -0.290 m Figure P8.17

4. Orin and Ann, two paramedics, rush a 60.0 kg man from the scene of an accident to a waiting ambulance, carrying him on a uniform 3.00 kg stretcher held by the ends. The stretcher is 2.60 m long and the man’s center of mass is 1.00 m from Ann. How much force must Orin and Ann each exert to keep the man horizontal? a. Orin = 230 N, Ann = 388 N b. Orin = 201 N, Ann = 411 N c. Orin = 241 N, Ann = 377 N d. Orin = 141 N, Ann = 477 N e. None of the above

It is sometimes important to determine the location of a person’s center of gravity(which coincides with the center of mass because the gravitational force is uniform at the scale of the human body). This can be done with the arrangement shown intheFigure below. A light (negligible mass) plank rests on two scales that read Fg1=380 N and Fg2=320 N. The scales are separated by a distance of 2.00 m. How far from the woman’s feet is her center of gravity?

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 A light plank rests on two scales that read F 91 = 440 N and F 92 = 320 N. The scales are separated by a distance of 2.00 m. How far from the woman's feet is her center of gravity? m

What is the student’s weight?

Problem 5: Fr Fm Bone -Muscle 100 30 cm W 4 cm 40 cm A simplified model of a human arm holding a weight is shown on the right. The length of the forearm is 40 cm and it has a mass of 1.7 kg. The bicep muscle is attached 4 cm in from the elbow joint and makes an angle of 73° with the forearm. The weight in the person's hand has a mass of 5 kg. a) What is the magnitude of the force provided by the bicep muscle needed to keep their arm at rest? b) What is the magnitude and direction of the force acting at the elbow (F;) in that same case?

13. Freddy who weights 20kg, sits on one side of the seesaw which is 3.5m away from the center. His father sits on the other side and balances the seesaw. If his Father weights 70kg, how far away from the center is he sitting? 14. A Steel wire 3 ft long and a copper wire 2 ft long each 0.20in? in cross section, are fastened together end to end and are then subjected to a Tension of 200lbs. Calculate the elongation of each wire if the young's modulus of steel is 29x10 and 19x10 for copper.. 15. What is the absolute pressure at the bottom of a 10m water tank?

A yo-yo (with inner radius r0.5in and outer radius r.=1.5in) rests against a wall while its string is attached to the top of the wall as shown. Find the minimum coefficient of friction to prevent slip. The yo-yo weighs 0.31bs. 30°

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