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Angle a Block swings while a van turns?

  1. Nov 3, 2008 #1
    1. A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 21.5 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 111 m), the block swings toward the outside of the curve. Then the string makes an angle x with the vertical. Find θ.

    2. centripetal acceleration Ac = v^2 /r
    normal force Fn= mg

    i then worked out that the sin x = Ac/Fn

    I think these should all be right

    3. Ac = 4.164 N

    And then sin x = Ac/Fn, but I have no idea where to go from here or even if I am on the right path
  2. jcsd
  3. Nov 3, 2008 #2


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    Hi eatingblaa! :smile:
    normal to what? :confused:

    Hint: use Newton's second law (F = ma), in a particular direction. :smile:
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