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Ch 13 Review Sheet
Algebra II Honors – Mr. Petach
Please write your answers on a separate sheet!
The Apollo 13 astronauts need to get back to Earth. To the astronauts, the Earth appears
to be moving relative to the moon (due to the Earth’s orbit around the sun and the moon’s
orbit around the Earth), so they need to ﬂy on a diagonal path in order to reach the Earth.
The Earth appears to be moving at 3,600 km/hr, and the spacecraft travels at 6,000 km/hr.
The path of the center of the Earth is given by the line
L
E
and the path of the spacecraft
is given by the line
L
S
. The parameter
s
represents the amount of time that the spacecraft
has been traveling since it left the moon, and the parameter
t
represents the amount of time
the Earth has been traveling since it crossed the yaxis. The center of the Earth crosses the
yaxis at the same time that the spacecraft leaves the moon. Thus, the center of the Earth
crosses the yaxis at
t
= 0, and the spacecraft leaves the moon at
s
= 0.
x
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 Fall '10
 Impemba
 Algebra

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