P7.13 The horizontal force P acts on the rim of the homogeneous cylinder ofradius R and weight W. Determine the smallest coefficient of static friction thatenables the cylinder to start rolling up the 30° incline30°Fig. P7.13 A30°6.4 in450Fig. P7.237.23 The 40-lb spool is suspended from the hanger GA and rests against a ver-tical wall. The center of gravity of the spool is at G and the weight of the hangeris negligible. The wire wound around the hub of the spool is extracted by pullingits end with the force P. If the coefficient of static friction between the spool andthe wall is 0.25, determine the smallest P that will extract the wire.9 in.

Question
Asked Sep 22, 2019
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P
7.13 The horizontal force P acts on the rim of the homogeneous cylinder of
radius R and weight W. Determine the smallest coefficient of static friction that
enables the cylinder to start rolling up the 30° incline
30°
Fig. P7.13
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P 7.13 The horizontal force P acts on the rim of the homogeneous cylinder of radius R and weight W. Determine the smallest coefficient of static friction that enables the cylinder to start rolling up the 30° incline 30° Fig. P7.13

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A
30°
6.4 in
450
Fig. P7.23
7.23 The 40-lb spool is suspended from the hanger GA and rests against a ver-
tical wall. The center of gravity of the spool is at G and the weight of the hanger
is negligible. The wire wound around the hub of the spool is extracted by pulling
its end with the force P. If the coefficient of static friction between the spool and
the wall is 0.25, determine the smallest P that will extract the wire.
9 in.
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A 30° 6.4 in 450 Fig. P7.23 7.23 The 40-lb spool is suspended from the hanger GA and rests against a ver- tical wall. The center of gravity of the spool is at G and the weight of the hanger is negligible. The wire wound around the hub of the spool is extracted by pulling its end with the force P. If the coefficient of static friction between the spool and the wall is 0.25, determine the smallest P that will extract the wire. 9 in.

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Expert Answer

Step 1

We are authorised to answer only one question at a time , for the remaining question , kindly repost the question again.

Given information:

P
R
fs
30°
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P R fs 30°

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Step 2

Free body diagram:

P
R cose
f sine
R
fs
f.cose
R sin
W
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P R cose f sine R fs f.cose R sin W

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Step 3

Balancing the forces for the above free bo...

for static friction f - R
P fcosRsin 0 = 0
P R cos
Rsin0 = 0
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for static friction f - R P fcosRsin 0 = 0 P R cos Rsin0 = 0

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