Determine the magnitude of the force P

International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
Publisher:Andrew Pytel And Jaan Kiusalaas
Chapter7: Dry Friction
Section: Chapter Questions
Problem 7.40P: The 60-lb plank rests on a frictionless roller at A, and the 20-lb triangular support BD. Both...
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b.7

The coefficient of static frictions between the 105-lb body and the 21° wedge is 0.40. Determine the magnitude of the force P
required to begin raising the 105-lb body if (a) rollers of negligible friction are present under the wedge, as illustrated, and (b) the
rollers are removed and the coefficient of static friction μs = 0.40 applies at this surface as well.
Answers:
(a) P =
(b) P=
i
i
21°
105 lb
lb
lb
Transcribed Image Text:The coefficient of static frictions between the 105-lb body and the 21° wedge is 0.40. Determine the magnitude of the force P required to begin raising the 105-lb body if (a) rollers of negligible friction are present under the wedge, as illustrated, and (b) the rollers are removed and the coefficient of static friction μs = 0.40 applies at this surface as well. Answers: (a) P = (b) P= i i 21° 105 lb lb lb
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