Question

9. A bicycle tire is spinning clockwise at 3.80 rad/s. During a time period of t = 2.35 s, the tire is stopped and spun in the opposite (counterclockwise) direction, also at 3.80 rad/s. Calculate the tire's average angular acceleration. a. 7.63 rad/s2 b. 5.43 rad/s2 c. 2.53 rad/s2 d. 4.03 rad/s2 e. 3.43 rad/s2

Answer 1

option E

Step-by-step explanation:

given,

angular speed of bicycle tire ()= 3.80 rad/s

time period = 2.35 s

tire stops and spun in opposite direction with angular velocity = 3.80 rad/s

average angular acceleration

initial angular speed = ω₀ = - 3.80 rad/s

final angular speed = ω₁ = 3.80 rad/s

change in angular velocity

`\Delta \omega = \omega - \omega_0`

`\Delta \omega = 3.80 - (-3.80)`

`\Delta \omega = 7.6\ rad/s`

average angular acceleration

`\alpha = (\Delta \omega)/(t)`

`\alpha = (7.6)/(2.35)`

`\alpha = 3.23\ rad/s^2`

approximately equal to 3.4 rad/s²

the correct answer is option E