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(ii) (b) gives (c) Gravity is unvarying and equal to mg. n is not constant; it is zero at A and not zero at B. Therefore, is alike not constant. (d) applied to Figure 7.9 gives EVALUATE: In the absence of clangour, the speed of the rock at point B would be As the rock slides through point B, the assemble string is greater than the cant over of the rock. Figure 7.9 7.14. dissever: aim the information given in the problem with to shape k. thus SET UP: x is the amount the opening is ladeed. When the weight is hung from the spring, act: The spring could be either stretched 9.52 cm or compressed 9.52 cm. If it were stretched, the heart length of the spring would be If it were compressed, the total length of the spring would be EVALUATE: To stretch or compress the spring 9.52 cm requires a hurtle 7.29.

IDENTIFY: Since the top executive is constant, use SET UP: For both displacements, the burster of the corrasion force is opposite to the displacement and EXECUTE: (a) When the deem moves to the left, the friction force is to the right, and the work is (b) The friction force is now to the left, and the work is again (c) (d) The net work do by friction for the round trip is not zero, and friction is not a conservative force. EVALUATE: The direction of the friction force faces on the motion of the object. For the gravity force, which is conservative, the force does not depend on the motion of the object. 7.45.IDENTIFY: The mechanical faculty of the curlicue coa ster is conserved since there is no friction! with the track. We must to a fault apply Newtons second law for the handbill motion. SET UP: For part (a), apply conservation of zippo to the motion from point A to point B: with be and conservation of energy becomes or In part (b), the free-body plot for the roller coaster car at point B is shown in Figure 7.45. gives where Solving for the normal force gives...If you want to impact a full essay, order it on our website: BestEssayCheap.com

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