PRACTICE IT Use the worked example above to help you solve this problem. A woman of...

 

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PRACTICE IT Use the worked example above to help you solve this problem. A woman of mass = 51.1 kg sits on the left end of a seesaw-a plank of length L = 4.92 m, pivoted in the middle as shown in the figure. (a) First compute the torques on the seesaw about an axis that passes through the pivot point. Where should a man of mass M = 73.0 kg sit if the system (seesaw plus man and woman) is to be balanced? 1.72 m (b) Find the normal force exerted by the pivot if the plank has a mass of mpl = 11.7 kg. 1.3363 ✓N (c) Repeat part (a), but this time compute the torques about an axis through the left end of the plank. 1.7 m EXERCISE HINTS: GETTING STARTED I'M STUCK! Suppose a 29.9-kg child sits 1.13 m to the left of center on the same seesaw as the problem you just solved in the PRACTICE IT section. A second child sits at the end on the opposite side, and the system is balanced. (a) Find the mass of the second child. 13.73 kg (b) Find the normal force acting at the pivot point. 427.5 x Your answers to part (a) and (b) are not consistent. Does the plank have weight? How will the weight of the plank affect the normal force? N PRACTICE IT Use the worked example above to help you solve this problem. A woman of mass = 51.1 kg sits on the left end of a seesaw-a plank of length L = 4.92 m, pivoted in the middle as shown in the figure. (a) First compute the torques on the seesaw about an axis that passes through the pivot point. Where should a man of mass M = 73.0 kg sit if the system (seesaw plus man and woman) is to be balanced? 1.72 m (b) Find the normal force exerted by the pivot if the plank has a mass of mpl = 11.7 kg. 1.3363 ✓N (c) Repeat part (a), but this time compute the torques about an axis through the left end of the plank. 1.7 m EXERCISE HINTS: GETTING STARTED I'M STUCK! Suppose a 29.9-kg child sits 1.13 m to the left of center on the same seesaw as the problem you just solved in the PRACTICE IT section. A second child sits at the end on the opposite side, and the system is balanced. (a) Find the mass of the second child. 13.73 kg (b) Find the normal force acting at the pivot point. 427.5 x Your answers to part (a) and (b) are not consistent. Does the plank have weight? How will the weight of the plank affect the normal force? N

Answer rating: 100% (QA)

Solution The normal force acting on the pivot point is ... View the full answer