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Homework Help: Couple of problems

  1. Oct 14, 2007 #1
    Hi guys new user seeking help with couple of problems. If anyone can help that would be very much appretiated. Thanks.

    1) A 1400 car traveling at a speed of 43.0 skids to a halt on wet concrete where = 0.530.

    How long are the skid marks?

    2) A truck is parked on a slope.

    How big is the friction force on the truck?

    3) What thrust does a 200 model rocket need in order to have a vertical acceleration of 12.0 .

    a) On Earth?
    b) On the moon, where

    4) A pickup truck with a steel bed is carrying a steel file cabinet. The coefficient of static friction for dry steel on steel is .

    If the truck's speed is 13.0 , what is shortest distance in which it can stop without the file cabinet sliding ?

    5) A chandelier with mass is attached to the ceiling of a large concert hall by two cables. Because the ceiling is covered with intricate architectural decorations (not indicated in the figure, which uses a humbler depiction), the workers who hung the chandelier couldn't attach the cables to the ceiling directly above the chandelier. Instead, they attached the cables to the ceiling near the walls. Cable 1 has tension and makes an angle of with the ceiling. Cable 2 has tension and makes an angle of with the ceiling.

    Find an expression for , the tension in cable 1, that does not depend on .
    Express your answer in terms of some or all of the variables , , and , as well as the magnitude of the acceleration due to gravity .
  2. jcsd
  3. Oct 14, 2007 #2


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    Staff Emeritus
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    Hi soknamal and welcome to the forums,

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