A 50.0-kg grindstone is a solid disk 0.520 m in diameter. You press an ax down on the rim with a normal force of 160 N ( Fig. P10.54 ). The coefficient of kinetic friction between the blade and the stone is 0.60, and there is a constant friction torque of 6.50 N · m between the axle of the stone and its bearings, (a) How much force must be applied tangentially at the end of a crank handle 0.500 m long to bring the stone from rest to 120 rev/min in 9.00 s? (b) After the grindstone attains an angular speed of 120 rev/min, what tangential force at the end of the handle is needed to maintain a constant angular speed of 120 rev/min? (c) How much time does it take the grindstone to come from 120 rev/min to rest if it is acted on by the axle friction alone? Figure P10.54
A 50.0-kg grindstone is a solid disk 0.520 m in diameter. You press an ax down on the rim with a normal force of 160 N ( Fig. P10.54 ). The coefficient of kinetic friction between the blade and the stone is 0.60, and there is a constant friction torque of 6.50 N · m between the axle of the stone and its bearings, (a) How much force must be applied tangentially at the end of a crank handle 0.500 m long to bring the stone from rest to 120 rev/min in 9.00 s? (b) After the grindstone attains an angular speed of 120 rev/min, what tangential force at the end of the handle is needed to maintain a constant angular speed of 120 rev/min? (c) How much time does it take the grindstone to come from 120 rev/min to rest if it is acted on by the axle friction alone? Figure P10.54
A 50.0-kg grindstone is a solid disk 0.520 m in diameter. You press an ax down on the rim with a normal force of 160 N (Fig. P10.54). The coefficient of kinetic friction between the blade and the stone is 0.60, and there is a constant friction torque of 6.50 N · m between the axle of the stone and its bearings, (a) How much force must be applied tangentially at the end of a crank handle 0.500 m long to bring the stone from rest to 120 rev/min in 9.00 s? (b) After the grindstone attains an angular speed of 120 rev/min, what tangential force at the end of the handle is needed to maintain a constant angular speed of 120 rev/min? (c) How much time does it take the grindstone to come from 120 rev/min to rest if it is acted on by the axle friction alone?
A 57.5-kg grindstone is a solid disk 0.6 m in diameter. You press an ax down
on the rim with a normal force of 164.9 N.
m
The coefficient of kinetic friction between the blade and the stone is 0.7, and
there is a constant friction torque of 9.5 N m between the axle of the stone
and its bearings. Another force is applied tangentially at the end of a crank
handle 0.5 m long to bring the stone from rest to 164.1 rev/min in 8.1 s.
After the grindstone attains an angular speed of 120 rev/min, what tangential
force at the end of the handle is needed to maintain a constant angular speed
of 120 rev>min?
*1 = 1/2 MR2
A 69.4-kg grindstone is a solid disk 0.54 m in diameter. You press an ax down
on the rim with a normal force of 3.8 N.
m
The coefficient of kinetic friction between the blade and the stone is 0.0, and
there is a constant friction torque of 4.6 N m between the axle of the stone
and its bearings. Another force is applied tangentially at the end of a crank
handle 1.0 m long to bring the stone from rest to 157.0 rev/min in 7.0 s.
After the grindstone is used to sharpen the axe at a constant angular speed of
120 rev/min, it has come to rest. How much time (s) does it take the
grindstone to come from 120 rev/min to rest if it is acted on by the axle
friction alone?
*1 = 1/2 MR2
A 50.0 kg grindstone is a solid disk 0.520 m in diameter. You press an ax down on the rim with a normal force of 160 N (Fig. ). The coefficient of kinetic friction between the blade and the stone is 0.60, and there is a constant friction torque of 6.50 N . m between the axle of the stone and its bearings. (a) How much force must be applied tangentially at the end of a crank handle 0.500 m long to bring the stone from rest to 120 rev/min in 9.00 s? (b) After the grindstone attains an angular speed of 120 rev/min, what tangential force at the end of the handle is needed to maintain a constant angular speed of 120 rev/min? (c) How much time does it take the grindstone to come from 120 rev/min to rest if it is acted on by the axle friction alone?
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