hysics Nid Unit & Day 7 1718 9 Secure https/ll session masteringphysics.com/myct

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hysics Nid Unit & Day 7 1718 9 Secure https/ll session masteringphysics.com/myct/Remview offset-next NM Unit 8 Day 7 17-18 Problem 8.40 80218767 ) 3014 PartA How large is her torque on the wheel, if the dameter of the bowl is 90 em Express your answer to two significant figures and include the appropriate units Constants A potter is shaping a bowl on a potier's wheel rotating at constant angular velocity of 1.8 rev/s (Figure 1) The friction force between her hands and the clay is 1.7 N total Tad Value Units Figure Part B How long would t take for the potter's wheel to stop if the only torque acting on it is due to the poter's hande? The moment of inartia of the wheel and the boul is O.11kg Express your answer to two significant figures and include the appropriate Value Units 10:05 up

Explanation / Answer

(a).

2 torque = F r

2 torque = (1.7)(0.09/2)

torque = 0.03825 Nm = 0.038 Nm (2 sf)

(b).

angular acceleration,

= -torque/I

and

0 = + t

0 = + (-torque/I) t

0 = (1.8 * 2) + (-0.03825/ 0.11) t     [multiplied by 2pi to convert from rev/s to rad/s]

t = 33 sec

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