lim (kl9356) – Homework 17 – Weathers – (17104)
1
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10
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001
(part 1 of 2) 10.0 points
a) Find the time it takes an object to hit the
ground when it is dropped from a height of 67
using the model
h
=

16
t
2
+
s,
where
s
is the initial height, and
t
is in sec
onds. Answer in units of sec.
002
(part 2 of 2) 10.0 points
b) Find the time it takes an object to hit the
ground when it is dropped from a height of
134 ft.
003
(part 1 of 2) 10.0 points
Given:
G
= 6
.
67259
×
10

11
N m
2
/
kg
2
Two hypothetical planets of masses 4
×
10
23
kg and 7
.
7
×
10
23
kg and radii 4
.
8
×
10
6
m
and 6
.
1
×
10
6
m, respectively, are at rest when
they are an infinite distance apart.
Because
of their gravitational attraction, they head
toward each other on a collision course.
When their centertocenter separation is
5
.
5
×
10
8
m, find their relative velocity. An
swer in units of m
/
s.
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 Fall '08
 Weathers
 Magnetism, Mass, Simple Harmonic Motion, Work, General Relativity, Black hole

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