(a) What is the mechanical advantage of a nail puller--similar to the one shown in Figure 5.15--where you exert a force 40.0 cm from the pivot and the nail is 1.75 cm on the other side? (b) What minimum force must you exert to apply a force of 1300 N to the nail?

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A schoolyard teeter-totter with a totallength of 6.4 m and a mass of 41 kg is pivoted at its center. A 21-kgchild sits on one end of the teeter-totter. (a) Where should a parentpush vertically downward with a force of 210 N in order to hold theteeter-totter level? (b) Where should the parent push with a force of310 N? (c) How would your answers to parts (a) and (b) change if themass of the teeter-totter were doubled? Explain

Consider the following. (a) What is the mechanical advantage of a wheelbarrow, such as the one shown in the figure, if the center of gravity of the wheelbarrow and its load has a perpendicular lever arm of 6.70 cm, while the handles have a perpendicular lever arm of 1.06 m? 15.820 (b) What upward force must you exert to support the wheelbarrow and its load if their combined mass is 57.5 kg? 35.617 (c) What force does the wheel exert on the ground? (Indicate the direction with the sign of your answer. Assume the positive direction points upward.) 527.85

A house painter is standing on a uniform, horizontal platform that isheld in equilibrium by two cables attached to supports on the roof.The painter has a mass of 75.0 kg and the mass of the platform is 20.0kg. The distance from the left end of the platform to where the painteris standing is d = 2.00 m and the total length of the platform is 5.0 m.(a) How large is the force exerted by the left hand cable? (b) Howlarge is the force exerted by the right hand cable? [Hint: You can placeyour axis in any convenient location if the object is not rotating.]

An athlete strengthens her leg and knee by doing "leg curls." While sitting on a bench with the leg initially bent at the knee, she supports a weight with the foot. She then slowly raises the foot and lower leg, with the upper leg held stationary. Find the tension in the quadriceps tendon for the position shown in the figure below. (Let w = 225 N, D = 44 cm and d = 5.5 cm.) please solve thank you

Unlike most of the other muscles in our bodies, the masseter muscle in the jaw, as illustrated in the figure, is attached relatively far from the joint, enabling very large forces to be exerted by the back teeth. This is shown in the figure below, where a person is biting down on a bullet placed between the back teeth. (FM = 200 N and r. = 3.7 cm.) M= 2.9 cm Masseter muscle гeaction (a) Using the information in the figure, calculate the magnitude of the force exerted by the teeth on the bullet. (b) Calculate magnitude of the force on the joint.

A 6.13m long rigid beam with a mass of 133.0kg is supported at each end. A 74.8kg student stands 3.68m from support 1. How much upward force does each support exert on the beam?

An athlete strengthens her leg and knee by doing "leg curls." While sitting on a bench with the leg initially bent at the knee, she supports a weight with the foot. She then slowly raises the foot and lower leg, with the upper leg held stationary. Find the tension in the quadriceps tendon for the position shown in the figure below. (Let w = 237 N, D = 43 cm and d = 5.2 cm.) Quadriceps tendon 60° W