PHY 317K
HOMEWORK # 3
DUE on October 14, 2009 by 8:00pm
Instructions:
Use a UT ANSWER SHEET to mark answers. Provide your
NAME
(last, first),
UTEID
, and
UNIQUE NUMBER
of the course. Sign and date it. The answer sheets must be
placed in the
317K box
located outside PAI 2.48.
Late homework will not be graded
.
Answer the following 76 questions:
1. The approximate value of
g
at an altitude above Earth equal to one Earth diameter is:
A) 9.8 m/s
2
B) 4.9 m/s
2
C) 2.5 m/s
2
D) 1.9 m/s
2
E) 1.1 m/s
2
2. Four particles, each with mass
m,
are arranged symmetrically about the origin on the
x
axis. A fifth particle, with mass
M
, is on the
y
axis. The direction of the gravitational
force on
M
is:
A)
↑
B)
↓
C)
←
D)
→
E) none of these directions
3. Three particles, two with mass
m
and one mass
M
, might be arranged in any of the four
configurations known below. Rank the configurations according to the magnitude of the
net gravitational force on
M
, least to greatest.
A) 1, 2, 3, 4
B) 2, 1, 3, 4
C) 2, 1, 4, 3
D) 2, 3, 4, 1
E) 1, 3, 2, 4
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