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lisa123465
02.08.2019 •
Physics
Two wheels have the same mass and radius of 4.4 kg and 0.48 m, respectively. one has (a) the shape of a hoop and the other (b) the shape of a solid disk. the wheels start from rest and have a constant angular acceleration with respect to a rotational axis that is perpendicular to the plane of the wheel at its center. each turns through an angle of 14 rad in 8.0 s. find the net external torque that acts on each wheel.
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Ответ:
1)![\sum T_{externalhoop}=0.4418Nm](/tpl/images/0163/2367/a135e.png)
2)![\sum T_{externaldisc}=0.2209Nm](/tpl/images/0163/2367/63283.png)
Explanation:
Using the second equation of angular motion we have
Since the wheels start from rest we ahve![omega _{o}=0](/tpl/images/0163/2367/c53e4.png)
Applying the given values in the equation we have
Now by newton's second law of motion in angular motion we have
1) For Hoop We have
Thus
2)For disc We have
Thus
Ответ: