Torque or tangential force needed to change a disc's angular speed in a given time

1. A.
   0.15 N-m
2. B.
   0.32 N-m
3. C.
   0.25 N-m
4. D.
   0.20 N-m

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1. A.
   $\frac{MR\omega}{4t}$
2. B.
   $\frac{MR\omega}{2t}$
3. C.
   $\frac{MR\omega}{t}$
4. D.
   $MR\omega t$

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1. A.
   $\ \frac{\pi}{2}\text{ }N$
2. B.
   $\ 2\pi\text{ }N$
3. C.
   $\pi N$
4. D.
   $\ 4\pi\text{ }N$

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1. A.
   $1$ N
2. B.
   $2$ N
3. C.
   $3$ N
4. D.
   $4$ N

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1. A.
   $5\pi\,Nm$
2. B.
   $10\pi\,Nm$
3. C.
   $20\pi\,Nm$
4. D.
   $40\pi\,Nm$

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