Post a New Question

Physics- Elena please help!

posted by .

A digital audio compact disc carries data along a continuous spiral track from the inner circumference of the disc to the outside edge. Each bit occupies 0.60 mm of the track. A CD player turns the disc to carry the track counter-clockwise above a lens at a constant speed of 1.22 m/s. Find the required angular speed (a) at the beginning of the recording, where the spiral has a radius of 2.10cm. (b) at the end of the recording, where the spiral has a radius of 6.10 cm. (c) A full- length recording lasts for 74 min, 33 s. Find the average angular acceleration of the disc as it spins from the outside at 2.10 cm to the inside at 6.10 cm.

  • Physics- Elena please help! -

    t=74 min33 sec =4473 sá

    ω1=v/R1 =1.22/0.021 = 58.1 rad/s
    ω2=v/R2 =1.22/0.061 = 20 rad/s

    ε= (ω2- ω1)/t =(20-58.1)/ 4473=-0.0085 rad/s²

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A solid disc with radius R is is spinning. An object exerts a force F at the edge of the disc to slow down the disc. The disc slows down to rest in 2.0 seconds. How long would the disc take to stop if: the mass of the disc doubled …
  2. Physics- Elena please help!

    A digital audio compact disc carries data along a continuous spiral track from the inner circumference of the disc to the outside edge. Each bit occupies 0.60 mm of the track. A CD player turns the disc to carry the track counter-clockwise …
  3. physics

    A digital audio compact disc carries data along a continuous spiral track from the inner circumference of the disc to the outside edge. Each bit occupies 0.60 mm of the track. A CD player turns the disc to carry the track counter-clockwise …
  4. physics

    A digital audio compact disc carries data along a continuous spiral track from the inner circumference of the disc to the outside edge. Each bit occupies 0.60 mm of the track. A CD player turns the disc to carry the track counter-clockwise …
  5. physics

    A digital audio compact disc carries data along a continuous spiral track from the inner circumference of the disc to the outside edge. Each bit occupies 0.60 mm of the track. A CD player turns the disc to carry the track counter-clockwise …
  6. Physics

    A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm. a) What is the period of rotation in seconds?
  7. Physics

    A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm. a) What is the period of rotation in seconds?
  8. physics

    A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm. a) What is the period of rotation in seconds?
  9. physics

    A shuffleboard disc has a mass of 250g. The coefficient of friction between the disc and the floor is .60. A player pushes the disc applying a horizontal force of 5.0 N for .35 s. How much does the disc weight?
  10. math

    A compact disc is placed in a player that randomly selects and plays songs from the disc.The compact disc contains 3 ballads, 4 instrumental pieces,X dance tracks and no other pieces.If the probability that the first song played will …

More Similar Questions

Post a New Question