The wheels, axle, and handles of a wheelbarrow weigh W = 66 N. The load chamber and its contents weigh WL = 525 N. The drawing shows these two forces in two different wheelbarrow designs. To support the wheelbarrow in equilibrium, the man's hands apply a force to the handles that is directed vertically upward. Consider a rotational axis at the point where the tire contacts the ground, directed perpendicular to the plane of the paper. Find the magnitude of the man's force for both designs. 3? v .n H 4 E .n H 0 A man holds a 154-N ball in his hand, with the forearm horizontal (see the figure). 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 20.0 N and has a center of gravity as indicated. Find (a) the magnitude of M and the (b) magnitude and (c) direction (as a positive angle counterclockwise from horizontal) of the force applied by the upper arm bone to the forearm at the elbow joint. Upper arm bone Flexor muscle M Elbow cg joint 0.0510 m+ 0.0890 m -0.330 m (a) Number Units (b) Number i Units (c) Number UnitsA 1430-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam. Using the data shown in the figure, find (a) the magnitude of the tension in the wire and the magnitudes of the (b) horizontal and (c) vertical components of the force that the wall exerts on the left end of the beam. 50.0 Beam 30.0 1960 N (a) Number Units (b) Number Units (c) Number UnitsA person is sitting with one leg outstretched and stationary, so that it makes an angle of 300" with the horizontal, as the drawing indicates. The weight of the leg below the knee is 34.0 N, with the center of gravity located below the knee joint. The leg is being held ) in this position because of the force M applied by the quadriceps muscle, which is attached 0.100 m below the kneejoint (see the a drawing). Obtain the magnitude of M. Awrecking ball (weight = 5150 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3830 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 ofthe force exerted on the lower end of the boom by the hinge at point P. (a) Number I Units [3