This preview shows pages 1–3. Sign up to view the full content.
homework 07 – ALIBHAI, ZAHID
1
Latest unpenalized work: Mar 5 2007 Monday
04:00 (after this date you can not make a
perfect score). Work cutoF: Mar 7 2007, 4:00
am.
Question 1
part 1 of 1
10 points
In introductory physics laboratories, a typ
ical Cavendish balance for measuring the
gravitational constant
G
uses lead spheres of
masses 2
.
34 kg and 13
.
9 g whose centers are
separated by 5
.
54 cm.
Calculate the gravitational force between
these spheres, treating each as a point mass
located at the center of the sphere. Use
G
=
6
.
67259
×
10

11
N m
2
/
kg
2
.
Answer in units of N.
Question 2
part 1 of 1
10 points
Given:
G
= 6
.
673
×
10

11
N
·
m
2
kg
2
Mars has a mass of about 6
.
97
×
10
23
kg,
and its moon Phobos has a mass of about
9
.
44
×
10
15
kg.
If the magnitude of the gravitational force
between the two bodies is 4.69
×
10
15
N, how
far apart are Mars and Phobos?
Answer in units of m.
Question 3
part 1 of 1
10 points
Planet X has three times the diameter and
six times the mass of the earth.
What is the ratio of gravitational accelera
tion at the surface of planet X to the gravita
tional acceleration at the surface of the Earth,
g
x
g
e
?
1.
g
x
g
e
=
5
49
2.
g
x
g
e
=
2
3
3.
g
x
g
e
=
9
64
4.
g
x
g
e
=
9
25
5.
g
x
g
e
=
2
25
6.
g
x
g
e
=
6
49
7.
g
x
g
e
=
7
16
8.
g
x
g
e
=
1
32
9.
g
x
g
e
=
5
16
10.
g
x
g
e
=
2
81
Question 4
part 1 of 1
10 points
Two iron spheres, of mass
m
and 2
m
,
respectively, and equally spaced points “
r
apart” are shown in the ±gure.
A
m
B
C
D
2
m
E
r
r
r
r
r
r
At which location would the net gravita
tional force on an object due to these two
spheres be a maximum?
1.
E
2.
C
3.
A
4.
D
5.
B
Question 5
part 1 of 2
10 points
Given:
G
= 6
.
672
×
10

11
N m
2
/
kg
2
.
The planet Mars requires 1
.
73 years to orbit
the sun, which has a mass of 2
×
10
30
kg, in
an almost circular trajectory.
Calculate the radius of the orbit of Mars as
it circles the sun.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Documenthomework 07 – ALIBHAI, ZAHID
2
Answer in units of m.
Question 6
This is the end of the preview. Sign up
to
access the rest of the document.
 Spring '08
 Turner
 Work

Click to edit the document details