1:51kık- M AA .content.blackboardcdn.com546Chapter 2Problems2.14 A box weighing 25 pounds (assumed concentratedat its center of gravity) is being pulled by a horizontalforce F equal to 20 pounds. What is the moment aboutpoint A? Does the box tip over?2.15 A large wood beam weighing 800 N is supported bytwo posts as shown. If an unthinking man weighing 700 Nwere to walk on the overhang portion of the beam, howfar can he go from point A before the beam tips over?(Assume the beam is resting on the two supports with nophysical connection.)

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Glencoe Physics: Principles and Problems, Student Edition

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Author:Paul W. Zitzewitz

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Chapter8: Rotational Motion

Section: Chapter Questions

Problem 74A

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Figure P8.27. Find the tension in each rope when a 700.-N worker stands 1.00 m from one end? e2cm lon ropes, as indicated by the blue vectors in 27. VA uniform plank of length 2.00 m and mass 30.0 ke by three ropes, as indicated by the blue vectors in supported Figure P8.27. Find the tension in each rope when a 700 N person is d = 0.500 m from the left end. er of gravig fo 12, modeling rethooran 8 B of model 10.26 T, T2 0.250 Theatthe le 40.0° lid or boln vibbud ns bano sdi svode m81 o + d » 3. 2.00 m di In bas rirob be ss gairda Figure P8.27 goil sdrto idgiod oh bail rel 2 00 bou d 28. A hungry bear weighing 700. N walks out on a heam in
In exercise physiologystudies, it is sometimesimportant todetermine the location ofa person’s center of gravity.This can be done withthe arrangement shownin Figure P8.21. A lightplank rests on two scalesthat read Fg1 = 380. N andFg2 = 320. N. The scales are separated by a distance of 2.00 m.How far from the woman’s feet is her center of gravity?
A 80-kg block is suspended as shown. The beam is weightless and is hinged to the wall at A. The tension force of the cable T has magnitude: (Use g = 9.8 m/s2) %3D T. 3m A 4m block O a 980 N Ob. 817 N Oc. 1143 N Od. 620N O e. 1307 N
The chewing muscle, the masseter, is one of the strongest in the human body. It isattached to the mandible (lower jawbone) as shown in Figure P8.33a. The jawbone ispivoted about a socket just in front of the auditory canal. The forces acting on the jawboneare equivalent to those acting on the curved bar in Figure P8.33b.
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A uniform, 255-N rod that is 2 mlong carries a 225-N weight at its right end andan unknown weight toward the left end asshown in Figure 1. When W is placed 50 cm fromthe left end of the rod, the system just balanceshorizontally when the fulcrum is located 75 cmfrom the right end.a. Find W.b. If W is now moved 25 cm to the right,how far and in what direction must thefulcrum be moved to restore balance?
The arm in Figure P8.17 weighs 41.5 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force F, in the deltoid muscle and the force F, exerted by the shoulder on the humerus (upper- arm bone) to hold the arm in the position shown. F, 12° F, '0.080 m -0.290 m Figure P8.17
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The young tree, originally bent, has been brought into the vertical position by adjusting the three guy-wire tensions to AB = 5 lb, AC = 11 lb, and AD = 15 lb. Determine the force and moment reactions at the trunk base point O. Neglect the weight of the tree. 5.2' 2.9' 5.8' y 2.9' 5.8' Answers: Fo = ( i i+ i j+ i k) Ib Mo = ( i i+ i j+ i k) Ib-ft
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