If the motor winds the cable with a constant speed of 3 ft/s, determine the power supplied to the motor. The load weighs 100 lb, and the efficiency of the motor is 0.8. Neglect the mass of the pulleys.
Added by Jose Ramon S.
Step 1
Given that the load weighs 100 lb and each pound is 4.45 newtons, we can calculate the weight of the load in newtons: Weight = 100 lb * 4.45 N/lb = 445 N Show more…
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The motor pulls on the cable at $A$ with a force $F=\left(30+t^{2}\right)$ Ib, where $t$ is in seconds. If the 34 -lb crate is originally on the ground at $t=0,$ determine its speed in $t=4 \mathrm{s}$ Neglect the mass of the cable and pulleys. Hint: First find the time needed to begin lifting the crate.
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