1. The double pulley shown is attached to a 8-mm-radius shaft that fits loosely in a fixed bearing. If the μ = 0.45 and μ = 0.40 and the weight of the pulley is 25 N, (a) determine the magnitude of the force P required to start raising the load, and (b) determine the magnitude of the force P required to start lowering the load a constant speed. 90 mm 45 mm Ý CI P 20 kg
1. The double pulley shown is attached to a 8-mm-radius shaft that fits loosely in a fixed bearing. If the μ = 0.45 and μ = 0.40 and the weight of the pulley is 25 N, (a) determine the magnitude of the force P required to start raising the load, and (b) determine the magnitude of the force P required to start lowering the load a constant speed. 90 mm 45 mm Ý CI P 20 kg
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 7.78P: The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016,...
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![1. The double pulley shown is attached to a 8-mm-radius shaft that fits loosely in a fixed
bearing. If the u, = 0.45 and μ = 0.40 and the weight of the pulley is 25 N, (a) determine
the magnitude of the force P required to start raising the load, and (b) determine the
magnitude of the force P required to start lowering the load a constant speed.
90 mm
T
45 mm/
CI
20 kg
P
FORMULAS:
tan = μ; M = Rrsin(p); M = rs =rW tan(+0), 0 = tan
2mº
= tan
np
2m](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9496fb66-15f0-4d2e-bc7e-ca3bb9b70577%2F451c4a92-181d-49f6-85bc-e3cf79c9b281%2Fe9inukj_processed.png&w=3840&q=75)
Transcribed Image Text:1. The double pulley shown is attached to a 8-mm-radius shaft that fits loosely in a fixed
bearing. If the u, = 0.45 and μ = 0.40 and the weight of the pulley is 25 N, (a) determine
the magnitude of the force P required to start raising the load, and (b) determine the
magnitude of the force P required to start lowering the load a constant speed.
90 mm
T
45 mm/
CI
20 kg
P
FORMULAS:
tan = μ; M = Rrsin(p); M = rs =rW tan(+0), 0 = tan
2mº
= tan
np
2m
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