The angular position of a wheel is given by the equation $$\(\theta(t)=2 t^{3}\)$$ $$\(-6 t^{2}\)$$, where $$\(\theta\)$$ is measured in radians and $$\(t\)$$ in seconds. When is the torque on the wheel equal to zero?

A.
\(t=0.33 \mathrm{~s}\)
B.
\(t=0.5 \mathrm{~s}\)
C.
\(t=1 \mathrm{~s}\)
D.
\(t=2 \mathrm{~s}\)
E.
\(t=3 \mathrm{~s}\)
Physics C(M)
AP
College Board
Exam No:AP Physics C Practice Test Year:2024 Question No:20

Answer:

C

Knowledge points:

5.2 Rotational Kinematics
5.3 Rotational Dynamics and Energy

Solution:

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