a wheel has a constant angular acceleration of 3.0 rad/s2. during a certain 4.0s interval it turns through an angle of 120 rad. assuming that the wheel started from rest, how long has it been in motion at the start of this 4 s interval

8 s

Explanation:

We are given that

Acceleration=

Time, t=4 s

Angle,

Initial angular velocity,

Let be the velocity at the start of this 4 s interval

We know that

Using the formula

t=8 s

b.transmitters send radio waves, and receivers capture radio waves.