Physics

A movie stunt man (mass 82.3 kg) stands on a window ledge 5.69 m above the floor. Grabbing a rope attached to a chandelier, he swings down to grapple with the movie’s villain (mass 72.3 kg), who is standing directly under the chandelier. (Assume that the stunt man’s center of mass moves downward 5.69 m. He releases the rope just as he reaches the villain) If the coefficient of kinetic friction of their bodies with the floor is uk = 0.66, how far do they slide?

Give your answer in meters to the second decimal place.

  1. 👍
  2. 👎
  3. 👁
  1. First get the kinetic energy of the stunt man at the crash.
    KE = decrease in potential energy = m g h = 82.3*9.81*5.69 (you do the numbers)use that to get the speed of the stunt man
    (1/2) m Vs^2 = KE where I am calling Vs speed of stunt man
    Then CRASH
    and the two stick together (vital fact for conservation of momentum
    so
    momentum stunt man = 82.3*Vs
    momentum of two together = (82.3+72.3)Vt
    where Vt is speed together after collision
    the momentum before = momentum after, so solve for Vt
    Now get the KEnew of both together
    (1/2) * total mass * Vt^2
    NOW we slide to a stop
    friction force FF = (82.3+72.3)(9.8)(.66)
    work done by friction = FF * distance slid = loss of KE = KEnew

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    A Norman window has the shape of a rectangle surmounted by a semicircle. If the perimeter of the window is 26 ft, express the area A of the window as a function of the width x of the window.

  2. physics

    A construction supervisor of mass M = 83.7 kg is standing on a board of mass m = 30.5 kg. The board is supported by two saw horses that are a distance of 4.50 m apart. If the man stands a distance x1 = 1.30 m away from saw horse 1

  3. Calculus 1

    A Norman window has the shape of a rectangle surmounted by a semicircle. If the perimeter of the window is 32 ft, express the area A of the window as a function of the width x of the window.

  4. physics

    According to newtons 1st law , construction workers are warned not to leave their hard hats on the rear window ledge of their cars, explain why?

  1. Differential Calculus

    A norman window has the shape of a rectangle surmounted by a semicircle. If the perimeter of the window 10 m, express the area A of the window as the function of width x of the window.

  2. Physics

    When man stands on a bathroom scale here on Earth, it reads 560N . Assume each planet to be a perfect sphere with the following parameters. What would his mass be on Mars if Mars has a mass of 6.419 x 10^23 kg and a radius of

  3. physics

    In a scene in an action movie, a stunt man jumps from the top of one building to the top of another building 4.4 m away. After a unning start, he leaps at an angle of 17◦ with respect to the flat roof while traveling at a speed

  4. physics

    A cement block accidentally falls from rest from the ledge of a 51.5 -m-high building. When the block is 12.9 m above the ground, a man, 1.60 m tall, looks up and notices that the block is directly above him. How much time, at

  1. Physics

    In a scene in an action movie, a stunt man jumps from the top of one building to the top of another building 5.0 m away. After a running start, he leaps at an angle of 10◦ with respect to the flat roof while traveling at a speed

  2. physical science

    A flower pot falls off a window ledge 10.0 m above the ground. Its velocity as it hits the ground is

  3. physics

    moving beltway at an airport has a speed v1 and a S length L. A woman stands on the beltway as it moves from one end to the other, while a man in a hurry to reach his flight walks on the beltway with a speed of v2 relative to the

  4. Physics

    A rock climber of mass 55 kg is hanging suspended from a rope tied to another climber of mass 65 kg on a horizontal cliff ledge. If the coefficient of kinetic friction between the climber on the ledge and the ledge is 0.45, what

You can view more similar questions or ask a new question.