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Chapter 12: Q67P (page 352)
A solid copper cube has an edge length of . How much stress must be applied to the cube to reduce the edge length to ? The bulk modulus of copper is .
Applied stress is, .
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Question: A rope of negligible mass is stretched horizontally between two supports that are 3.44 m apart. When an object of weight 3160 N is hung at the center of the rope, the rope is observed to sag by 35.0 cm . What is the tension in the rope?
A trap door in a ceiling is square, has a mass of and is hinged along one side, with a catch at the opposite side. If the center of gravity of the door is toward the hinged side from the door鈥檚 center, what are the magnitudes of the forces exerted by the door on (a) the catch and (b) the hinge?
In Fig. 12-67a, a uniformbeam is centered over two rollers. Vertical lines across the beam mark off equal lengths. Two of the lines are centered over the rollers; a package of tamales is centered over roller B.What are the magnitudes of the forces on the beam from (a) roller Aand (b) roller B? The beamis then rolled to the left until the right-hand end is centered over roller B(Fig. 12-67b).What now are the magnitudes of the forces on the beam from (c) roller Aand (d) roller B? Next, the beam is rolled to the right. Assume that it has a length of 0.800 m. (e) what horizontal distance between the package and roller Bputs the beam on the verge of losing contact with rollerA?
A cubical box is filled with sand and weighs . We wish to 鈥渞oll鈥� the box by pushing horizontally on one of the upper edges. (a) What minimum force is required? (b) What minimum coefficient of static friction between box and floor is required? (c) If there is a more efficient way to roll the box, find the smallest possible force that would have to be applied directly to the box to roll it. (Hint:At the onset of tipping, where is the normal force located?)
A particle is acted on by forces given, in newtons, by and . (a) What are the xcomponent and (b) ycomponent of the force Fthat balances the sum of these forces? (c) What angle does have relative to the ?
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