The arm in the figure below weighs 36.7 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. (Enter your answers to at least the nearest newton.) 0.080 m 0.290 m

3. Three kids stand on a see-saw as shown. The see-saw has a uniform cross section and weighs 15 lb, while kids A, B, and C weigh 35 lb, 45 lb, and 25 lb, respectively. Determine the weight of the rock at point E required for the system to maintain a perfect balance, and the reaction at support D. Write your answers using 3 significant digits. B A C 1 ft 1 ft 7.5 ft 0.5 ft E

A 143.4-N bird feeder is supported by three cables as shown in the figure below. Find the tension in each cable. Left Cable ____ N Right cable ___ N Bottom Cable _____ N

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. μà 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