Abar on a hinge starts from rest and rotates with an angular acceleration α = (10 + 6t), where α is in rad/s2 and t is in seconds. determine the angle in radians through which the bar turns in the first 4.00 s.

Explanation:

As we know that angular acceleration is defined as rate of change in angular velocity

so here we can write

Now we will have

here initial angular speed is ZERO as it start from rest

now we can say that rate of change in angular position is known as angular velocity

So here we will have

increase masses, decrease separation