The 50-lb load is hoisted by the pulley system and motor M. If the motor exerts a

Chapter 14, Problem R14-6

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QUESTION:

The 50-lb load is hoisted by the pulley system and motor M. If the motor exerts a constant force of 30 lb on the cable, determine the power that must be supplied to the motor if the load has been hoisted s = 10 ft starting from rest. The motor has an efficiency of \(\varepsilon = 0.76\).

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QUESTION:

The 50-lb load is hoisted by the pulley system and motor M. If the motor exerts a constant force of 30 lb on the cable, determine the power that must be supplied to the motor if the load has been hoisted s = 10 ft starting from rest. The motor has an efficiency of \(\varepsilon = 0.76\).

ANSWER:

Step 1 of 5

Mass of the crate, .

Speed,  

Distance arise,  

The motor has an efficiency e = 0.74.

The motor exerts a constant force of T=30 lb

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