College Physics

posted by .

At t=0 the current to a dc electric motor is reversed, resulting in an angular displacement of the motor shaft given by
theta(t)= 258t - 20.4t^2 - 1.47t^3

How many revolutions does the motor shaft turn through between the time when the current is reversed and the instant when the angular velocity is zero?

  • College Physics -

    I figured it out! I wasn't putting the t at omega=0 in the first equation in properly before converting from radians to revolutions!

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    An electric motor has 72 turns of wire wrapped on a rectangular coil, of dimensions 3cm by 4cm. Assume that the motor uses 14A of current and that a uniform 0.5T magnetic field exists within the motor. 1)What is the maximum torque …
  2. Physics

    The resistance of the wire in the windings of an electric starter motor for an automobile is 0.0190 Ohms. the motor is connected to a 12 V battery. What current will flow through the motor when it is stalled?
  3. science

    Question: If you have an electric motor on a bench and hook it to the power the shaft turns. If you put the shaft in a vise the casing of the motor will turn. Now:...put this motor in free space no gravity and attach a battery for …
  4. algebra

    The power (P) required to run a motor is equal to the voltage (E) applied to that motor times the current (I) supplied to the motor. If the motor data says the motor uses 180 watts of power and the voltage applied to the motor is 120 …
  5. physics

    2. At time t =0, the current to the dc motor is reversed, resulting in an angular displacement of the motor shaft given by θ = (198 rad/s)t – (24 rad/s2)t2 – (2 rad/s3)t3 a. At what time is the angular velocity of the motor …
  6. science

    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 …
  7. Physic

    A vacuum pump is connected to its electric motor by a belt drive (Fig. 9-40, not to scale). The motor rotates at a rate of 1000 rev/min and the diameter of the motor shaft is 2.9 cm. How large (diameter) should the pulley be if it …
  8. Physics

    The angular velocity of a process control motor is (21−12t2) rad/s, where t is in seconds. A)At what time does the motor reverse direction?
  9. Physics

    The angular velocity of a process control motor is (21−12t2) rad/s, where t is in seconds. A)At what time does the motor reverse direction?
  10. math

    How many revolutions will a 5" id x 5/8 id pulley on a electric motor shaft rotating at 1700 rpms.

More Similar Questions