physics

posted by .

A 4.0 kg pulley of radius 0.15 m is pivoted about an axis through its center. What constant torque is required for the pulley to reach an angular speed of 25 rad/s after rotating 6.0 revolutions, starting from rest?

  • physics -

    Torque=momentinertia*anglular acceleration

    Torque= I * angacc


    but

    wf^2=wi^2+2*angacc*displacement

    wf^2=wi^2+2*angacc*revolutions*2PI

    where w is in rad/sec, angacc in rad/sec^2

    solve for angacc, then torque

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics, please help me today.

    four pulleys are connected by two belts. Pulley A (radius 15cm) is the drive pulley and it rotates at 10 rad/s. Pulley B (radius 10 cm) is connected by belt 1 to pulley A. Pulley B' (radius 5cm) is concentric with pulley B and is rigidly …
  2. physics

    A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 7 rev/s. 55 revolutions later, its angular speed is 21 rev/s. (a) Calculate the angular acceleration. …
  3. physics - drwls?

    A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 7 rev/s. 55 revolutions later, its angular speed is 21 rev/s. (a) Calculate the angular acceleration. …
  4. physics

    A pulley rotating in the counterclockwise direction is attached to a mass suspended from a string. The mass causes the pulley's angular velocity to decrease with a constant angular acceleration α = -2.2 rad/s2. If the pulley's …
  5. physics

    A 4.0 kg pulley of radius 0.15 m is pivoted about an axis through its center. What constant torque is required for the pulley to reach an angular speed of 25 rad/s after rotating 6.0 revolutions, starting from rest?
  6. physics

    starting from rest s=0,pulley A (rA=50 mm)is given a constant angular acceleration, A=6 rad/s2. Pulley C(rC=150mm) has an inner hub D (rD=75 mm) which is fixed to C and turns with it. What is the speed of block B when it has risen …
  7. physics

    A spinning disk of mass 5.0 kg and radius 0.25m is rotating about an axis through its center at 400 rev/min. a.) What is the angular velocity of the disk in rad/s?
  8. Physics

    A spinning disk of mass 5.0 kg and radius 0.25m is rotating about an axis through its center at 400 rev/min. a.) What is the angular velocity of the disk in rad/s?
  9. physics

    A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 7.8 rad/s; 60 radians later, its angular speed is 19 rad/s. Calculate (a) the angular acceleration …
  10. PHYSICS

    A constant torque of 30m⋅N is applied to the rim of a 6.0-kg uniform disk of radius 0.20m .What is the angular speed of the disk about an axis through its center after it rotates 2.0 revolutions from rest?

More Similar Questions