The blades in a blender rotate at a rate of 7700 rpm. When the motor is turned o

Question

The blades in a blender rotate at a rate of 7700 rpm. When the motor is turned off duringoperation, the blades slow to rest in 3.5 s. What is the angular acceleration as theblades slow down?
rad/s2
Calculate the net torque about the axle of the wheel shown inFig. 8-39. Assume that a friction torque of 0.50 m·N opposes the motion and thatF = 18.
Magnitude
m·N
The blades in a blender rotate at a rate of 7700 rpm. When the motor is turned off duringoperation, the blades slow to rest in 3.5 s. What is the angular acceleration as theblades slow down?
rad/s2
Calculate the net torque about the axle of the wheel shown inFig. 8-39. Assume that a friction torque of 0.50 m·N opposes the motion and thatF = 18.
Magnitude
m·N

Explanation / Answer

initial angular velocity is         o = ( 7700 rev / min)(2 rad /rev)(1min / 60s)               = 805.93 rad /s angular acceleration is           = ( - o ) / t            = [0 - 805.93 rad /s ] / 3.5            = -230.26 rad/s2


upload fig for second problem,



   

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