Question

The angular speed of a motor wheel is increased from $1200 \,rpm$ to $3120\, rpm$ in $16$ seconds. The angular acceleration of the moto wheel is

• A. $6 \,\pi \,rad / s ^{2}$
• B. $8\, \pi\, rad / s ^{2}$
• C. $2 \,\pi \,rad / s ^{2}$
• D. $4\, \pi \,rad / s ^{2}$

Answer 1

Answer: (D)

$\alpha=\frac{ W _{2}- W _{1}}{ t }=\frac{2 \pi n _{2}-2 \pi n _{1}}{ t }$