PHY 3221: Mechanics I
Fall Term 2009
Midterm Exam 3, December 2, 2009
•
This is a closed book exam lasting 50 minutes.
•
Since calculators are not allowed on this test, if the problem asks for a numerical answer,
answering 2 + 2 is as good as 4, and
√
2 is as good as 1
.
4142
...
.
•
There are three problems and two multiple choice questions worth a total of 20 pts. The
problems and questions appear on the second and third page of this test.
Begin each
problem on a fresh sheet of paper. Use only one side of the paper. Avoid microscopic
handwriting.
•
Put your name, the problem number and the page number in the upper righthand corner
of each sheet.
•
To receive partial credit you must explain what you are doing. Carefully labelled figures
are important! Randomly scrawled equations are not helpful.
•
Draw a box around important results (or at least results which you think might be im
portant).
•
Good luck!
1
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Problem 1.
[2 pts] An object is dropped from an altitude of one Earth radius above the
Earth’s surface. If
M
is the mass of Earth and
R
is its radius, the speed
v
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 Spring '08
 CHAN
 mechanics, Mass, outer radius R2

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