Answer
(a) A length of 3.14 meters of rope unwinds in one revolution.
(b) The rope does $15.7~J$ of work on the wheel.
(c) The torque on the wheel due to the rope is $2.50~N \cdot m$
(d) In 1.00 revolution, the angular displacement is $6.28~rad$
(e) The product $\tau~\Delta \theta$ is $15.7~J$, which is equal to the work done on the wheel by the rope, as was calculated in part (b).
Work Step by Step
(a) We can find $d$, the length of rope that unwinds in one revolution:
$d = 2\pi~R = (2\pi)(0.50~m) = 3.14~m$
A length of 3.14 meters of rope unwinds in one revolution.
(b) We can find the work done by the rope:
$Work = F~d = (5.00~N)(3.14~m) = 15.7~J$
The rope does $15.7~J$ of work on the wheel.
(c) We can find the torque on the wheel due to the rope:
$\tau = R~F = (0.50~m)(5.00~N) = 2.50~N \cdot M$
The torque on the wheel due to the rope is $2.50~N \cdot m$
(d) In 1.00 revolution, the angular displacement is $2\pi~rad$ which is $6.28~rad$
(e) We can find the product $\tau~\Delta \theta$:
$\tau~\Delta \theta = (2.50~N \cdot m)(6.28~rad) = 15.7~J$
The product $\tau~\Delta \theta$ is $15.7~J$, which is equal to the work done on the wheel by the rope, as was calculated in part (b).
