Question

The
tub of a washing machine is turning at a rate of 3 revolutions per
second. When the person doing laundry opens the lid, the tub starts
slowing down at a constant angular acceleration, coming to a stop
after 12 sec. Through how many revolutions does the tub turn while
it is slowing down?

Answer #1

A top-loading washing machine has a cylindrical tub that rotates
about a vertical axis. The tub of one such machine starts from rest
and reaches an angular speed of 5.0 rev/s in 8.0 s. The lid of the
machine is then opened, which turns off the machine, and the tub
slows to rest in 12.0 s. Through how many revolutions does the tub
turn during this 20 s interval? Assume constant angular
acceleration while it is starting and stopping.
____...

The tub of a clothes washer goes into its spin-dry cycle
starting from rest and reaches an angular speed of 4.70 rev/s in
7.03 seconds. At this point, the person doing the laundry opens the
lid, and a safety switch turns off the washer. The tub then slows
to a stop in 20.04 seconds. Assuming a constant angular
acceleration, while the tub is starting and stopping, how many
revolutions does the tub turn during this 27.07 second
interval?

The tub of a washer goes into its spin-dry cycle, starting from
rest and reaching an angular speed of 7.0 rev/s in 8.0 s. At this
point the person doing the laundry opens the lid, and a safety
switch turns off the washer. The tub slows to rest in 13.0 s.
Through how many revolutions does the tub turn during this 21 s
interval? Assume constant angular acceleration while it is starting
and stopping. rev

The tub of a washer goes into its spin-dry cycle, starting from
rest and reaching an angular speed of 4.0 rev/s in 8.0 s. At this
point, the person doing the laundry opens the lid, and a safety
switch turns off the washer. The tub slows to rest in 11.0 s.
Through how many revolutions does the tub turn during this 19 s
interval? Assume constant angular acceleration while it is starting
and stopping.
________rev

The tub of a washer goes into its spin-dry cycle, starting from
rest and reaching an angular speed of 4.0 rev/s in 13.0 s. At this
point, the person doing the laundry opens the lid, and a safety
switch turns off the washer. The tub slows to rest in 14.0 s.
Through how many revolutions does the tub turn during this 27 s
interval? Assume constant angular acceleration while it is starting
and stopping.

The tub of a washer goes into its spin-dry cycle, starting from
rest and reaching an angular speed of 2.0 rev/s in 8.0 s. At this
point, the person doing the laundry opens the lid, and a safety
switch turns off the washer. The tub slows to rest in 12.0 s.
Through how many revolutions does the tub turn during this 20-s
interval? Assume constant angular acceleration while it is starting
and stopping. rev

The tub of a washer goes into its spin-dry cycle, starting from
rest and reaching an angular speed of 4.0 rev/s in 7.0 s. At this
point, the person doing the laundry opens the lid, and a safety
switch turns off the washer. The tub slows to rest in 12.0 s.
Through how many revolutions does the tub turn during this 19 s
interval? Assume constant angular acceleration while it is starting
and stopping.
_____rev

The tub of a washer goes into its spin cycle, starting from rest
and gaining angular speed steadily for 8.00 s, at which time it is
turning at 6.00 rev/s. At this point, the person doing the laundry
opens the lid, and a safety switch turns off the washer. The tub
smoothly slows to rest in 9.00 s. Through how many revolutions does
the tub turn while it is in motion? rev

The
tub of a washing machine goes into its spin cycle, starting from
rest and gaining angular speed steadily for 8.00 s, at which time
it is turning at 4.00 rev/s. At this point, the lid of the washing
machine is opened, and a safety switch turns it off. The tub then
smoothly slows to rest in 13.0 s. Through how many revolutions does
the tub rotate while it is in motion?

1. A disk of mass M=160kg and radius R=0.40m spins with an
initial rate of 12 revolutions per second. Because of friction in
the bearing, the disk slows down at a uniform rate. After 20
minutes it comes to a stop.
(a) How many revolutions does the disk make before coming to
rest?
(b) What is the moment of inertia of the disk?
(c) Find the angular acceleration of the disk as it slows
down.
(d) Find the torque that...

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