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.
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.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:Question 1
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
5°
Figure Q1
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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