I would appreciate help with any of the following problems. Thank you. 22. In an
ID: 1696067 • Letter: I
Question
I would appreciate help with any of the following problems. Thank you.22. In an isometric exercise a person places a hand on a scale and pushes vertically downward, keeping the forearm horizontal. This is possible because the triceps muscle applies an upward force perpendicular to the arm, as the figure indicates. The forearm weighs 22.1 N and has a center of gravity as indicated. The scale registers 113 N. Determine the magnitude of .
Distance between the force applied by the muscle and the elbow joint 0.025 m. The distance between the elbow joint and the arms center of gravity is 0.15 m. Distance between the arms center of gravity and the center of the scale is 0.15 m. I was not able to find the answer to this problem using the solution posted on the website.
26.A wrecking ball (weight = 4310 N) is supported by a boom, which may be assumed to be uniform and has a weight of 2550 N. As the drawing shows, a support cable runs from the top of the boom to the tractor. The angle between the support cable and the horizontal is 32°, and the angle between the boom and the horizontal is 48°. Find (a) the tension in the support cable and (b) the magnitude of the force exerted on the lower end of the boom by the hinge at point P.
56. Two identical wheels are moving on horizontal surfaces. The center of mass of each has the same linear speed. However, one wheel is rolling, while the other is sliding on a frictionless surface without rolling. Each wheel then encounters an incline plane. One continues to roll up the incline, while the other continues to slide up. Eventually they come to a momentary halt, because the gravitational force slows them down. Each wheel is a disk of mass 3.64 kg. On the horizontal surfaces the center of mass of each wheel moves with a linear speed of 5.26 m/s. (a),(b) What is the total kinetic energy of each wheel? (c), (d) Determine the maximum height reached by each wheel as it moves up the incline. I was able to solve for the rolling wheel but couldn't find the right answers for the sliding wheel.
66. A thin uniform rod is rotating at an angular velocity of 1.89 rad/s about an axis that is perpendicular to the rod at its center. As the figure indicates, the rod is hinged at two places, one-quarter of the length from each end. Without the aid of external torques, the rod suddenly assumes a "u" shape, with the arms of the "u" parallel to the rotation axis. What is the angular velocity of the rotating "u"?
76. A woman who weighs 501 N is leaning against a smooth vertical wall, as the drawing shows. Find (a) the magnitude of the force N (directed perpendicular to the wall) exerted on her shoulders by the wall and the (b) horizontal and (c) vertical components of the force exerted on her shoes by the ground.
Explanation / Answer
22 ) M * ( 0.025 m ) = 113 N ( 0.30) * 22.1 N ( 0.15m )
M = 4495.14N
77 )