P 150 1150 W |120 lb 15° 4 ft 15° 4 ft 15° 150 4 F 120 lb FBD FBD 15° 4 ft Fig. P4.12 15° Fig. P4.13 4.13 Calculate the force P that is required to hold the 120-lb roller at rest on the rough incline. F 4.14 Solve Prob. 4.13 if the force P pushes rather than pulls. AN FBD Fig. P4.14 4 ft

P 150 1150 W |120 lb 15° 4 ft 15° 4 ft 15° 150 4 F 120 lb FBD FBD 15° 4 ft Fig. P4.12 15° Fig. P4.13 4.13 Calculate the force P that is required to hold the 120-lb roller at rest on the rough incline. F 4.14 Solve Prob. 4.13 if the force P pushes rather than pulls. AN FBD Fig. P4.14 4 ft

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter4: Coplanar Equilibrium Analysis

Section: Chapter Questions

Problem 4.44P: The uniform ladder of weight W is raised slowly by applying a vertical force P to the rope at A....

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Question

Please help me for 4.14. Why is my answer 43.9? The correct answer is 53.6.

15°
1 15°
W
|120 lb
15° ?
4 ft
P
15°
4 ft
15°
B.
150 4
A
F
NB
120 lb
FBD
P
15°
4 ft
FBD
Fig. P4.12
15°
Fig. P4.13
4.13 Calculate the force P that is required to hold the 120-lb roller at rest on the
rough incline.
F
4.14 Solve Prob. 4.13 if the force P pushes rather than pulls.
N
FBD
Fig. P4.14

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