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

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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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

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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