1. Draw a FBD to determine the elbow moment of force necessary to maintain the forearm in a horizontal position. Solve for the elbow moment with the following: subject mass = 75 kg, forearm length = 32 cm. %3D
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- (a) When opening a door, you push on it perpendicularly with a force of 55.0 N at a distance of 0.850m from the hinges. What torque are you exerting relative to the hinges? (b) Does it matter if you push at the same height as the hinges?A 35 N forearm (we are ignoring the hand for this problem) are held at a 45 deg angle to the vertically oriented humerus. The COM of the forearm is located at a distance of 15 cm from the joint center at the elbow, and the elbow flexor muscles have a 3 cm moment arm. How much force must be exerted by the elbow flexor muscles to maintain this position? Hide answer choices A A 35 N C 81.7 N 123.7 N D 371 N Fm 45° * --Wt₂The young tree, originally bent, has been brought into the vertical position by adjusting the three guy-wire tensions to AB = 5 lb, AC = 11 lb, and AD = 15 lb. Determine the force and moment reactions at the trunk base point O. Neglect the weight of the tree. 5.2' 2.9' 5.8' y 2.9' 5.8' Answers: Fo = ( i i+ i j+ i k) Ib Mo = ( i i+ i j+ i k) Ib-ft
- 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 =1. The tongs are used to grip the ends of the drilling pipe with the center at C. a) At what angle 0 would the torque (moment) reach a maximum about C? b) What is the value of that maximum 36.87€$k1 F=500 Ibs torque or moment (using the angle in (a) ) about C? c) If the slope of the force was set to a 3/4 slope (i.e., y=3 and x=4) what would the torque or moment be about y 3 point C? d) Check your answer in (c) above by calculating the moment of this force about C by using a Vector formulation with the position vector CD. (Show the matrix and then calculate it manually and use your calculator to verify the manual calculation.) 10.0 in MP 30.0 in DC = 31.662HER A man holds a 175-N ball in his hand, with the forearm horizontal (see the drawing). He can support the ball in this position because of the flexor muscle force M, which is applied perpendicular to the forearm. The forearm weighs 21.4 N and has a center of gravity as indicated. Upper am bone Flexor muscle cing fc Elbow joint 89) 00510 m r 0.0890 m 0.330 m- (a) Find the magnitude of M 1149 X N (b) Find the magnitude and direction of the force applied by the upper arm bone to the forearm at the elbow joint. magnitude direction downward Additional Materials Book ??TO MacBook Ait 7.
- 2. A person's arm is used for ergonomic studies. If the distance of the AB, BC, and CD segments are 35.0 mm, 28.0 mm, and 19.0 mm, respectively, and the model is holding a small 1.5-lb load on the distal metacarpals of her hand . Determine the magnitude and direction of the moment of force with respect to) to the shoulder joint to the carpus1. One end of a uniform meterstick is placed against a vertical wall. The other end is held by a lightweight cord that makes an angle o with the stick. The coefficient of static friction between the end of the meter stick and the wall is = 0.400 Me a. what is the minimum value the off can have if the stick is to remain in equilibrium? Hint: ure tano = W-fr = Ms n Get 0.24.lf a walking stick with a mass of 300 g can be balanced by placing a mass M of g at a distance L of 40 cm from the fulcrum, then the center of gravity of the 150 stick is cm away from the fulcrum.
- A 50 N hand and forearm are held at a 35° angle to the vertically oriented humerus. The CG of the forearm and hand is located at a distance of 12.5 cm from the joint center at the elbow, and the elbow flexor muscles attach at an average distance of 2.5 cm from the joint center. (Assume that the muscles attach at an angle of 35° to the forearm bones.) How much force must be exerted by the forearm flexors to maintain this position?1.A vault is opened by applying a force of 300 N perpendicular to the plane of the door, 0.80 m from the hinges. Find the torque due to this force about an axis through the hinges.a. 120 N⋅mb. 240 N⋅mc. 300 N⋅m d. 360 N⋅m2.A meter stick is supported by a knife-edge at the 50-cm mark. Doug hangs masses of 0.40 and 0.60 kg from the 20-cm and 80-cm marks, respectively. Where should Doug hang a third mass of 0.30 kg to keep the stick balanced?a. 20cmb. 70cm c. 30cm d. 25cm3.A copper wire of length 2.0 m, cross sectional area 7.1 × 10−6 m2 and Young's modulus 11 × 1010 N/m2 has a 200-kg load hung on it. What is its increase in length? (g = 9.8 m/s2)a. 0.50 mmb. 1.0 mmc. 2.5 mm d. 5.0 mmThe 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