1
Phy 3221
Due: January 26, 2011
Homework set # 3
You are encouraged and welcome to work together on the homework assignments. But your
homework must be in your own handwriting.
If you expect credit for your homework, then it is best to make it easily readable.
Problem
1:
Look at Figure 2A on p 94. A block of mass
m
is released from a height
h
= 5
R
above the ground and slides down the frictionless incline shaped as in the ﬁgure.
Give your answers in terms of
m
,
g
, and
R
. Assume that the size of the block is much
smaller than
R
. Be certain that the dimensions work out properly.
a. What is the force on the block at the bottom of the incline at point A?
b. At what speed does the block leave the track?
Textbook: Prob. 25
Textbook: Prob. 29
Textbook: Prob. 219 Assume that the object is launched oﬀ the top of a tall tower, where
x
0
=
y
0
= 0 (for simplicity), and let the initial components of the velocity be
v
0
x
and
v
0
y
.
Don’t be concerned with the object hitting the ground. Here are some suggestions for this
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 Spring '08
 CHAN
 mechanics, Derivative, Work, Square number, initial components

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