Angular acceleration and time for toy car on circular track

[cobrasny]

1. a) A X kg toy car accelerates at constant rate from V_o m/s to V_f m/s in C revolutions while going around a circular track of radius R cm. Find:

- α, the magnitude of the angular acceleration of the car.
- t, the time it took to reach the final speed




2. To calculate the angular acceleration, I tried velocity over radius, V_o/R and V_f/R to get delta W(omega); and then tried using the formula W_f² = W_o² + 2*alpha*(C*2*Pi), and solved for alpha, but got the wrong answer. I do not know how to get time without acceleration. Any help would be appreciated.

 

[alphysicist]

Hi cobrasny,

1. a) A X kg toy car accelerates at constant rate from V_o m/s to V_f m/s in C revolutions while going around a circular track of radius R cm. Find:

- α, the magnitude of the angular acceleration of the car.
- t, the time it took to reach the final speed




2. To calculate the angular acceleration, I tried velocity over radius, V_o/R and V_f/R to get delta W(omega); and then tried using the formula W_f² = W_o² + 2*alpha*(C*2*Pi), and solved for alpha, but got the wrong answer.

What answer did you get?