A ceiling fan with 89-cm-diameter blades is turning at 64 rpm .?
A ceiling fan with blades measuring 89 cm in diameter is operating at a speed of 64 revolutions per minute (rpm). Once turned off, the fan takes 25 seconds to come to a complete stop.
a) What is the speed of the tip of a blade 10 seconds after the fan has been turned off?
b) How many revolutions does the fan complete during the stopping period?
2 Answers
It depends on whether the fan is decelerating at a constant rate.
"Coasts" is a very vague term.
Feb 04, 2025
r = 0.89/2m= 0.445m;
t =25; v=0; u=64 rpm = 64* 2*pi /60 = 6.7 rad/s
v =u+at
0 = 6.7 + 25 a
a = - 0.268 rad/s2
a) v = u +at
v = 6.7 - 0.268 * 10
v = 4.02 rad/s
speed of the tip of a blade = 0.445 * 4.02 = 1.789m/s --answer
b) s = ut + 0.5 at^2
s = 6.7 * 25 - 0.5 * 0.268* 25^2
s = 83.75rad
= 13.33 rev
answer
revolutions the fan turned while stopping
Related Questions
Have you ever noticed how the rear wheel of a bike seems to follow the front wheel closely? Why does this happen, and is...
Please identify each of the following as measurements: Length Area Volume Mass Density Time Temperature...
A rescue pilot needs to drop a survival kit while flying at an altitude of 2,000.0 meters with a forward velocity of 100...
I have a question regarding torque in a magnetism context. I understand that the equation τ = IABsin(θ) will be relevant...
A 4.5 kg box slides down a 4.4 m high frictionless hill, starting from rest. It then travels across a 2.4 m wide horizon...
A radio telescope features a parabolic surface, as illustrated below. Given that the telescope is 1 meter deep and 12 me...
A rapidly spinning paddle wheel raises the temperature of 200 mL of water from 21 degrees Celsius to 25 degrees Celsius....
A large lightning bolt carried a current of 20,000 A and moved 30.0 C of charge. What was the duration of the lightning...
How long will it take to pass a passenger car at 60 mph without oncoming traffic? Could you please provide a detailed ex...
"Here is the figure illustrating the force experienced by a 3.0 kg particle: http://session.masteringphysics.com/problem...