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March 25, 2017

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A car tire rotates with an average angular speed of 29rad/s.
In what time interval will the tire rotate 3.5 times?
Answer in units of sec.

  • physics - ,

    Answer in m/s.
    The speed of a moving bullet can be deter-
    mined by allowing the bullet to pass through
    two rotating paper disks mounted a distance
    72 cm apart on the same axle. From the
    angular displacement 32.1  of the two bul-
    let holes in the disks and the rotational speed
    862 rev/min of the disks, we can determine
    the speed of the bullet.

    What is the speed of the bullet?
    Answer in units of m/s.

  • physics - ,

    Answer in revs.
    The tub of a washer goes into its spin-
    dry cycle, starting from rest and reaching an
    angular speed of 4.2 rev/s in 4.5 s . At this
    point the person doing the laundry opens the
    lid, and a safety switch turns off the washer.
    The tub slows to rest in 12.9 s .
    Through how many revolutions does the
    tub turn? Assume constant angular accelera-
    tion while it is starting and stopping.
    Answer in units of rev.

  • physics - ,

    In the Bohr model of the hydrogen atom,
    the speed of the electron is approximately
    1.97 × 106 m/s.
    Find the central force acting on the electron
    as it revolves in a circular orbit of radius
    4.72 × 10−11 m.
    Answer in units of N.

  • physics - ,

    39.92

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