Posted by **bruce** on Saturday, April 27, 2013 at 11:56pm.

At time t =0, the current to the dc motor is reversed, resulting in an angular displacement of the motor shaft given by è = (198 rad/s)t – (24 rad/s2)t2 – (2 rad/s3)t3 (15 marks)

a. At what time is the angular velocity of the motor shaft zero?

b. Calculate the angular acceleration at the instant that the motor shaft has zero angular velocity.

c. Through how many revolutions does the motor shaft turn between the time when the current is reversed and the instant when the angular velocity is zero?

d. How fast was the motor shaft rotating at t=0, when the current was reversed?

e. Calculate the average angular velocity for the time period from t = 0 to the time calculated in part (a).

## Answer this Question

## Related Questions

- physics - 2. At time t =0, the current to the dc motor is reversed, resulting in...
- College Physics - At t=0 the current to a dc electric motor is reversed, ...
- physics - A 4.50-kg wheel that is 34.5 cm in diameter rotates through an angle ...
- Physics - At t = 0, a wheel rotating about a fixed axis at a constant angular ...
- Physics - The shaft of a pump starts from rest and has an angular acceleration ...
- Physics - A bicycle starts at the origin of a circular track that has a ...
- Physics - Your electric drill rotates initially at 5.11 rad/s. You slide the ...
- Physics - The angular velocity of a process control motor is (21−12t2) ...
- Physics - The angular velocity of a process control motor is (21−12t2) ...
- physics help - a particle moves uniformly around the circumference of a circle ...

More Related Questions