The meterstick shown is 100 cm long. It is free to pivot around its center of gravity (CG), which is at the 50 cm mark. There is 10 20 30 40 50 60 a 23.0 N block hanging from the 80 cm mark. Decide where each of the other blocks should be placed, one at a time, to balance out the 23.0 N block. 3 2 At what mark on the meter stick would you place a 17.0 N block to balance the 23.0 N block? mark: 9.412 cm At what mark on the meter stick would you place a 40.0 N block to balance the 23.0 N block? 40.25 mark: cm Incorrect

1:51 kık- M A A .content.blackboardcdn.com 5 46 Chapter 2 Problems 2.14 A box weighing 25 pounds (assumed concentrated at its center of gravity) is being pulled by a horizontal force F equal to 20 pounds. What is the moment about point A? Does the box tip over? 2.15 A large wood beam weighing 800 N is supported by two posts as shown. If an unthinking man weighing 700 N were to walk on the overhang portion of the beam, how far can he go from point A before the beam tips over? (Assume the beam is resting on the two supports with no physical connection.)

4. Orin and Ann, two paramedics, rush a 60.0 kg man from the scene of an accident to a waiting ambulance, carrying him on a uniform 3.00 kg stretcher held by the ends. The stretcher is 2.60 m long and the man’s center of mass is 1.00 m from Ann. How much force must Orin and Ann each exert to keep the man horizontal? a. Orin = 230 N, Ann = 388 N b. Orin = 201 N, Ann = 411 N c. Orin = 241 N, Ann = 377 N d. Orin = 141 N, Ann = 477 N e. None of the above

A 164-cm-tall person lies on a light (massless) board which is supported by two scales, one under the top of her head and one beneath the bottom of her feet. The two scales read, respectively, 35.1 and 31.6 kg. (Figure 1) Part A What distance is the center of gravity of this person from the bottom of her feet? Express your answer to three significant figures and include the appropriate units. d = for Part A for Party do for Part redo fo Part A reser for Part A keyboard shortcuts for Part A Value Units

Two kids are on a uniform seesaw supported at its center. The kid is on the right side of the seesaw has a mass m kg and is at a distance 1.59 from the center of the seesaw. The kid is on the left side of the seesaw has a mass 30.8 kg and is at a distance 1.49 from the center of the seesaw. The seesaw is in static equilibrium. What is the mass m in kg? Give your answer to three significant figures.

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A 164-cm-tall person lies on a light (massless) board which is supported by two scales, one under the top of her head and one beneath the bottom of her feet. The two scales read, respectively, 35.1 and 31.6 kg. (Figure 1) Part A What distance is the center of gravity of this person from the bottom of her feet? Express your answer to three significant figures and include the appropriate units. for Part A for Parte do for Part redo foPart A reetfor Part A keyboard shortcuts for Part A help for Part A d= Submit Value Units Units input for part A Previous Answers Request Answer

3. A meter stick has a pivot that is located in the middle (50 cm). On this meter stick we place 150 g @ 32 cm, 300 g @ 45 cm, 100 g @80 cm and 300 g @80 cm. a. How much mass needs to be placed at 55 cm in order to balance the meter stick. b. Where will you put 500 g in order to balance the meter stick?