*mmh A person exerts a horizontal force of 190 N in the test apparatus shown in the drawing. Find the horizontal force M (magnitude and direction) that his flexor muscle exerts on his forearm. 15. 190 N 0.34 m Flexor muscle M 0,054 m Elbow joint Problem 15
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- 5. The biceps exerts a pulling force of 800 N on the radius. The force acts at an angle of 30 degree in the anterior Fx and superior Fy direction. Calculate the force Fx that flexes the elbow joint as shown in the diagram. (Given that cos 30-0.866 and sin 30=0.5). Fy a.400 b.693 c.512 d.122 e.330 Ans:c Fx 800 NВ A cook holds a 1.72-kg carton of milk at arm's length (see the figure below). What force Fa must be exerted by the biceps muscle? (Ignore the weight of the forearm. Give the magnitude.) N Milk 75.00 25.0 cm- 8.00 cmI have a shelf full of textbookd.Each book has a mass of 1.0 kg and mus=0.3. a. How hard do I need to push horizontally to unstick the top book from the rest of the pile? b. How many books can I unstick from the top of the pile if I push with a force of 16N?
- 1) necessary condition for Rigid Body Static Equilibrium or Particle Static Equilibrium requires that the Rigid Body or the Particle experiences_________. A. only small forces B. only large forces C. no balanced forces D. no unbalanced forces 2. Given three force vectors P, Q and R where:P = 300 N ?Q = 400 N ?R = 500 N ?What is the Magnitude of the Resultant of these three vectors? A. 768 N B. 430 N C. 707 N D. 1200 NConsider 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 18.0 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 0.255 m? _______ J d. What is her useful power output in watts if she does 21 push-ups in one minute? _______ W3. A cable goes over a frictionless pulley at B and supports a block of mass m. The other end of the cable is pulled by a horizontal force P. If the cable has a mass per length of 0.3 kg/m, determine values of P and m that will maintain the cable in the position shown. 5 m P (horizontal) A В. m -10 m Ans.m=4.725 kg; p=3.225 kg
- A bridge of length 57 m and mass 80000 kg is supported at each end. A truck of mass 38200 kg is located 27 m from the left end. A A 27 m B 57 m What is the force on the bridge at the left point of support? The acceleration of gravity is 9.8 m/s². Answer in units of N. Your response... i Previous Responses X #1.412105.263 PALETTE01. If cable CB is subjected to a tension that is twice that of cable CA, determine the angle 0 for equilibrium of the 10-kg cylinder. Also what are the tensions in wires CA and CB? iIf 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?
- The two planks are connected together by cable BC and a smooth spacer DE. Determine the reactions at the smooth supports A and F.and also find the force developed in the cable and spacer. Match the answers. 100 lb 200 lb -2 ft--2 ft- ft2 ft- 182 160 180 1. reaction at A= 168 2. reaction at F = 176 3. Foc- 128 4. FDE 5. 150 120 140Figure 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 inA cook holds a 1.52-kg carton of milk at arm's length (see the figure below). What force F must be exerted by the biceps muscle? (Ignore the weight of the forearm. Give the magnitude.) 426 Your response differs from the correct answer by more than 10%. Double check your calculations. N Milk 75.0° -25.0 cm 8.00 cm Need Help? Read It