rathbun (rar2954) – HW #7 – Antoniewicz – (57380)
1
This
printout
should
have
19
questions.
Multiplechoice questions may continue on
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before answering.
001 (part 1 of 2) 10.0 points
A 1190 kg car starts from rest and accelerates
uniformly to 18
.
3 m
/
s in 11
.
6 s
.
Find the average power developed by the
engine.
Assume that air resistance remains
constant at 387 N during this time.
Answer in units of hp.
002 (part 2 of 2) 10.0 points
Find the instantaneous power output of the
engine at
t
= 11
.
6 s just before the car stops
accelerating.
Answer in units of hp.
003 (part 1 of 2) 10.0 points
On the way to the moon, the Apollo astro
nauts reach a point where the Moon’s gravi
tational pull is stronger than that of Earth’s.
Find the distance of this point from the
center of the Earth.
The masses of the
Earth and the Moon are 5
.
98
×
10
24
kg and
7
.
36
×
10
22
kg, respectively, and the distance
from the Earth to the Moon is 3
.
84
×
10
8
m.
Answer in units of m.
004 (part 2 of 2) 10.0 points
What
is
the
acceleration
due
to
the
Earth’s gravity at this point?
The value
of
the
universal
gravitational
constant
is
6
.
672
×
10

11
N
·
m
2
/
kg
2
.
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 Spring '08
 Turner
 Physics, Mass, kg, Kepler's laws of planetary motion, TB TA TB

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