If a machine has a maximum power output of 1005ft.lbs/sec and it can push an object with 115 lbs . of force a distance of 12 feet . How long will this take? 9.8 seconds 12.6 seconds 1.4 seconds
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If the object in question 15 is lifted in 2 seconds, what is the power of the lifter?
A $0.25$ -hp motor is used to lift a load at the rate of $5.0 \mathrm{~cm} / \mathrm{s}$. How great a load can it raise at this constant speed? Assume the power output of the motor to be $0.25 \mathrm{hp}=186.5 \mathrm{~W}$. In $1.0 \mathrm{~s}$, the load $m g$ is lifted a distance of $0.050 \mathrm{~m}$. Therefore, Work done in $1.0 \mathrm{~s}=($ weight $)($ height change in $1.0 \mathrm{~s})=(\mathrm{mg})(0.050 \mathrm{~m})$ By definition, Power = Work / Time, and so $$ 186.5 \mathrm{~W}=\frac{(m g)(0.050 \mathrm{~m})}{1.0 \mathrm{~s}} $$ Using $g=9.81 \mathrm{~m} / \mathrm{s}^{2}$, we find that $m=381 \mathrm{~kg}$. The motor can lift a load of about $0.38 \times 10^{3} \mathrm{~kg}$ at this speed.
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