A potter is shaping a bowl on a potter\'s wheel rotating at constant angular vel

Question

A potter is shaping a bowl on a potter's wheel rotating at constant angular velocity of 1.6 rev/s (Figure 1). The friction force between her hands and the clay is 1.5 N total.

Part A

How large is her torque on the wheel, if the diameter of the bowl is 9.0 cm?

Express your answer to two significant figures and include the appropriate units.

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Part B

How long would it take for the potter's wheel to stop if the only torque acting on it is due to the potter's hands? The moment of inertia of the wheel and the bowl is 0.11kg?m2.

Express your answer to two significant figures and include the appropriate units.

A potter is shaping a bowl on a potter's wheel rotating at constant angular velocity of 1.6 rev/s (Figure 1). The friction force between her hands and the clay is 1.5 N total.

Part A

How large is her torque on the wheel, if the diameter of the bowl is 9.0 cm?

Express your answer to two significant figures and include the appropriate units.

?total =

nothingnothing

SubmitRequest Answer

Part B

How long would it take for the potter's wheel to stop if the only torque acting on it is due to the potter's hands? The moment of inertia of the wheel and the bowl is 0.11kg?m2.

Express your answer to two significant figures and include the appropriate units.

t =

Explanation / Answer

Part A

diameter=9 cm=0.09 m

radius = 0.09/2=0.045m

friction force=1.5 N

torque=1.5*0.045=0.0675 Nm

Part B:

angular deceleration=0.0675/0.11=0.614 rad/s2

initial angular velocity=1.6 rev/s=1.6*2*pi=10.05 rad/s

time required to stop the wheel=10.05/0.614=16.37 seconds

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