 Physics
2 April, 08:47

# The blades in a blender rotate at a rate of 7700 rpm. when the motor is turned off during operation, the blades slow to rest in 2.5 s. what is the angular acceleration as the blades slow down?

+1
Answers (1)
1. 2 April, 09:14
0
Angular acceleration = (change in angular speed) / (time for the change)

Change in angular speed = (speed at the end) - (speed at the beginning)

For this fan, speed at the end = 7700 rpm, speed at the end = 0.

Change in angular speed = - 7700 rpm

Angular acceleration = (-7700 rpm) / (2.5 sec)

Angular acceleration = - 3,080 rev per minute / sec

That's a perfectly good and true answer to the question, but the units are ugly. We really need to fix the units, and convert them into something prettier before we hand in this assignment.

1 rev = 2π radians, and

1 minute = 60 seconds.

So

Angular acceleration =

(-3,080 rev/min-sec) · (2π rad/rev) · (1 min/60 sec)

AngAccel = (-3,080 · 2π · 1 / 60) · (rev·rad·min / min·sec·rev·sec)

AngAccel = (-102 and 2/3 · π) · (rad/s²)

AngAccel = - 322.5 radian/s²
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “The blades in a blender rotate at a rate of 7700 rpm. when the motor is turned off during operation, the blades slow to rest in 2.5 s. what ...” in 📙 Physics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.