Question

A cooling fan is turned off when it is running at 850 rpm. It turns 1350 revolutions before it comes to a stop. (a) What was the fan’s angular acceleration, assumed constant. (b) How long did it take the fan to come to a complete stop?

Answer #1

A cooling fan is turned off when it is running at 920 rev/min.
It turns 1100 revolutions before it comes to a stop.
Part A What was the fan's angular acceleration, assumed
constant? Express your answer using three significant figures.
Part B How long did it take the fan to come to a complete stop?
Express your answer to three significant figures and include the
appropriate units.

The blade in a food processor spins at 1700 rpm. After the
machine is turned off, the blade comes to a stop in 3.7s. How many
revolutions does it make during this time, assuming constant
angular deceleration?

An electric fan is turned off, and its angular velocity
decreases uniformly from 540 rev/min to 220 rev/min in a time
interval of length 3.85 s . (a) Find the angular acceleration in
revolutions per second per second. (b) Find the number of
revolutions made by the fan blades during the time that they are
slowing down in part A. (c) How many more seconds are required for
the fan to come to rest if the angular acceleration remains
constant...

An electric fan is turned off, and its angular velocity
decreases uniformly from 570 rev/min to 250 rev/min in 3.00 s .
Find the angular acceleration in rev/s2.
Find the number of revolutions made by the motor in the 3.00 s
interval.
How many more seconds are required for the fan to come to rest
if the angular acceleration remains constant at the value
calculated in part A?

When starting a fan, it communicates a constant angular
acceleration of 2.00 rad / s2. (a) Calculate the time necessary for
it to acquire a speed of 900 r.p.m. (b) How many laps does it make
in that time? (c) If after turning it off, it makes 75 turns before
coming to a complete stop, how long does it take to stop?

An electric fan is turned off, and its angular velocity
decreases uniformly from 550 rev/min to 150 rev/min in a time
interval of length 3.85
A)Find the angular acceleration in rev/s2.
B)Find the number of revolutions made by the motor in the time
interval of length 3.85 s
C)How many more seconds are required for the fan to come to rest
if the angular acceleration remains constant at the value
calculated in part A?

When a fan is turned off, its angular speed decreases from 27
rad/s to 4.0 rad/s in 1.7 revolutions. Assuming it is constant,
what is the angular acceleration of the fan?
-210 rad/s2
-1.1 rad/s2
-9.8 rad/s2
-33 rad/s2

An electric fan is turned off, and its angular velocity
decreases uniformly from 550 rev/min to 180 rev/min in a time
interval of length 3.70 s.
1- Find the angular acceleration in rev/s2.
2- Find the number of revolutions made by the motor in the time
interval of length 3.70 s.
3- How many more seconds are required for the fan to come to
rest if the angular acceleration remains constant at the value
calculated in part A?

QUESTION 3
An electric fan is turned off, and it slows down from 356
revolutions/s to 80.1 revolutions/s in 4.07 seconds. How many times
did the fan blades spin in this time?
QUESTION 4
A disk rotates about a fixed axis through its center of mass and
perpendicular to the disk. It starts from rest and accelerates
uniformly, reaching angular speed ω after 8.44
revolutions. If it continues to accelerated at the same rate, how
many more revolutions would it...

while staring at your ceiling fan, you decide to study the
rotation. You discover that the fan makes a complete revolution
every 0.770s. When you turn the fan off, you find that it takes
65.0 s for it to come to rest. You then measure the blades and find
the fan has a 1.10 m diameter.
A) Find the initail angular speed of the fan
B) Find the angular acceleration of the fan
C) Calculate the inear speed of the...

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