An automobile accelerates from zero to 30 m/s in 6.0 s. the wheels have a diameter of 0.40 m. what is the average angular acceleration of each wheel?

To solve this problem we will use the concepts related to angular motion equations. Therefore we will have that the angular acceleration will be equivalent to the change in the angular velocity per unit of time.

Later we will use the relationship between linear velocity, radius and angular velocity to find said angular velocity and use it in the mathematical expression of angular acceleration.

The average angular acceleration

Here

= Angular acceleration

Initial and final angular velocity

There is not initial angular velocity,then

We know that the relation between the tangential velocity with the angular velocity is given by,

Here,

r = Radius

= Angular velocity,

Rearranging to find the angular velocity

Remember that the radius is half te diameter.

Now replacing this expression at the first equation we have,

Therefore teh average angular acceleration of each wheel is

i don't know that i agree with that but what's the question ?

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s