Ch3 HW2 (Homework)
Arthur Barfield
PHYS 2211, section M, Fall 2008
Instructor: Jennifer Curtis
Web
Assign
Current Score:
9 out of 21
Due:
Wednesday, September 10, 2008 09:00 AM EDT
Description
Gravitational force and prediction of motion.
Instructions
Reading: Sec. 3.43.6.
In question 5 we lead you through the several steps necessary to calculate the gravitational
force as a vector. In question 6 we ask you to do a similar calculation on your own; carry out
the same steps as in question 5.
The due date for this assignment is past.
Your work can be viewed below, but no changes
can be made.
1. [MI2 03.X.08.01]
2/2 points
The mass of the Sun is 2
10
30
kg, and the mass of
Venus
is 4.9
10
24
kg. The distance from
the Sun to
Venus
is 1.1
10
11
m.
(a) Calculate the magnitude of the gravitational force exerted by the Sun on
Venus
.
5.4e22
5.43e+22
N
(b) Calculate the magnitude of the gravitational force exerted by
Venus
on the Sun.
5.4e22
5.43e+22
N
Solution or Explanation

grav
 = G
M
1
M
2
/r
2
, therefore the magnitude of the gravitational force is the same for both
masses.
2. [MI2 03.RQ.28]
4/5 points
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(a) Calculate the magnitude of the gravitational force exerted by
Mercury
on a
80
kg human
standing on the surface of
Mercury
. (The mass of
Mercury
is 3.3
10
23
kg and its radius is 2.4
10
6
m.)
305.7
307
N
(b)Calculate the magnitude of the gravitational force exerted by the human on
Mercury
.
305.7
307
N
(c) For comparison, calculate the approximate magnitude of the gravitational force of this
human on a similar human who is standing
2.5
meters away.
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 Spring '09
 Kindermann
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