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Name (Last, First) ____________ , ____________ Recitation TA ____________ Section Number_______
Physics 151
Problem Set #6
due ______________________
Answer Structure [4 pts]
_________
1.
[8 points]
Two students want to raise a heavy box onto the back of a truck. They do
this by putting a rope through a handle on the box, and each lifting one side of the
rope, as sketched. The arrangement is symmetrical, so that the rope makes an angle
φ
with the horizontal on either side. The box is moved at a constant speed.
In this problem you will compute the magnitude of the tension in the rope. Let the
mass of the trunk (including the handle) be
M
, and neglect the mass of the rope.
a)
Draw a free body diagram of the forces on the handle beside the “real world”
picture below.
φ
φ
M
b)
Choose a sensible coordinate system, and write each of the forces in terms of your
coordinates. You may use either vector notation, or ordered pairs.
c)
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 Spring '10
 Tessier

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