Review
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 63 kg crate is pulled up a $\theta = 50^\circ$ incline by a pulley and motor system. Initially at rest, the crate is pulled $s = 5.1$ 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. (Figure 1)
Considering the coefficient of kinetic friction, $\mu_k = 0.15$, determine the power that the motor must supply to the crate the instant the crate travels a distance of 5.1 m.
Express your answer to two significant figures and include the appropriate units.
View Available Hint(s)
P = Value Units
Submit
Part B - Power supplied to the motor when efficiency is considered
If the motor has an efficiency of $\epsilon = 0.86$, what power must be supplied to the motor to raise the crate?
Express your answer to two significant figures and include the appropriate units.
View Available Hint(s)
P = Value Units
Figure
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