Question 23 of 32 The bones of the forearm (radius and ulna) are hinged to the humerus at the elbow. The biceps muscle connects to the bones of the forearm about 2.15 cm beyond the joint. Biceps muscle Assume the forearm has a mass of 2.15 kg and a length of 0.405 m. When the humerus and the biceps are nearly vertical and the forearm is horizontal, if a person wishes to Humerus- hold an object of mass 4.95 kg so that her forearm remains motionless, what is the force exerted by the biceps muscle? Radius M Elbow- Ulna force: Hand about us privacy policy terms of use contact us help careers tv W MacBook Air 8628-1

(b) A heavy uniform rod AB of weight W is hinged at A to a fixed point. It is pulled aside by a horizontal force P so that it rests inclined at an angle 0 to the vertical. Show that (i) the magnitude of the force Pis 1-cos2e W 2V 1-sin24 (ii) the reaction at the hinge is V3+ sec*0

(II) A 15-cm-long tendon was found to stretch 3.7 mm bya force of 13.4 N. The tendon was approximately roundwith an average diameter of 8.5 mm. Calculate Young’smodulus of this tendon.

17-45. The drop gate at the end of the trailer has a mass of 1.25 Mg and mass center at G. If it is supported by the cable AB and hinge at C, determine the tension in the cable when the truck begins to accelerate at 5 m/s?. Also, what are the horizontal and vertical components of reaction at the hinge C? 30 1.5 m 45°

Assume Young’s modulus for bone is 1.40×1010 N/m2 . The bone breaks if stress greater than 1.50 × 109 N/m2 is imposed on it. (i) What is the maximum force that can be exerted on the femur bone in the leg if it has a minimum effective diameter of 2.50 cm? (ii) If this much force is applied compressively, by how much does the 20.0 cm long bone shorten?

How much compression acts on the hip during two-legged standing, given that the joint supports 250 N of body weight and the abduct muscles are producing 600 N of tension? What is the angle α of R?

(II) An iron bolt is used to connect two iron plates together. The bolt must withstand shear forces up to about 3300 N. Calculate the minimum diameter for the bolt, based on a safety factor of 7.0.

(II) Find the tension in the two cords shown in Fig. 9-45. Neglect the mass of the cords, and assume 9. that the angle 6 is 33° and the mass m is 170 kg. FIGURE 9-45 Problem 11.

1. (1) Three forces are applied to a tree sapling, as shown in Fig. 12-45, to stabilize it. If FA = 385 N and FB = 475 N, find Fe in magnitude and direction. FB FIGURE 12-45 FC Problem 1. FIGURE 12-46 Problem 2. 2. (1) Approximately what magnitude force, FM, must the extensor muscle in the upper arm exert on the lower arm to hold a 7.3-kg shot put (Fig. 12-46)? Assume the lower arm has a mass of 2.3 kg and its CG is 12.0 cm from the elbow-joint pivot. 2.5 cm FM -30.0 cm- 105° Elbow joint FA