ces is 0.4. The pitch of the thread on the shaft is 5 mm. Take the mean radius of the screw to be 15 mm. a. Sketch free body diagrams for the block and the wedge. b. Neglecting the weight of the wedge, determine the force that must applied to raise the block with the wedge. c. Sketch a free body diagram that can be used to determine a relation between the force that can turn the screw, and the minimum force that the screw must exert on the wedge in order to raise block A. d. Using your free body diagram from (c), derive a relation between the force that can turns the screw to push the wedge, and the force the screw exerts on the wedge in order to raise block A. e. Determine the minimum couple that must turn the screw in order to raise block A using t
The mass of block A in Figure 5 is 60 kg. The coefficient of friction between the thread and the mating groove is 0.2 and that between all other rubbing surfaces is 0.4. The pitch of the thread on the shaft is 5 mm. Take the mean radius of the screw to be 15 mm.
a. Sketch free body diagrams for the block and the wedge.
b. Neglecting the weight of the wedge, determine the force that must applied to raise the block with the wedge.
c. Sketch a free body diagram that can be used to determine a relation between the force that can turn the screw, and the minimum force that the screw must exert on the wedge in order to raise block A.
d. Using your free body diagram from (c), derive a relation between the force that can turns the screw to push the wedge, and the force the screw exerts on the wedge in order to raise block A. e. Determine the minimum couple that must turn the screw in order to raise block A using the relation you obtained from (d)
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