Learning Goal:
To use the principle of work and energy to determine characteristics of a mass being pulled up an incline and determine the power that must be supplied to the system when the efficiency of the input system is considered.
As shown, a 62 kg crate is pulled up a θ = 65 ∘incline by a pulley and motor system. Initially at rest, the crate is pulled s = 2.9 m up along the incline. Undergoing constant acceleration, the crate reaches a speed of 2.6 m/s at the instant it has traveled this distance.
Part A)
Power supplied to the crate when friction is considered
Considering the coefficient of kinetic friction, μk = 0.15, determine the power that the motor must supply to the crate the instant the crate travels a distance of 2.9 m .
Part B)
Power supplied to the motor when efficiency is considered
If the motor has an efficiency of ε = 0.88 , what power must be supplied to the motor to raise the crate?
Homework Answers
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of the incline so that it will reach the skier.
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Learning Goal:
To set up and analyze equations of motion in a cylindrical
coordinate system.
The mechanism shown in the figure below rotates about the vertical
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unstretched length of 310 mm and the spring constant is
k=160 N/m. The distance d=200 mm , and the collar
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vertical axis.
(Figure 1)
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