aliu (fa5484) – HW6 – mackie – (20225)
1
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printout
should
have
9
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001
10.0points
The compressor on an air conditioner draws
36
.
6 A when it starts up. The startup time is
about 0
.
313 s.
How much charge passes a crosssectional
area of the circuit in this time?
Answer in units of C.
002
10.0points
The current in a wire decreases with time
according to the relationship
I
= (1
.
17 mA)
×
e

at
where
a
= 0
.
13328 s

1
.
Determine
the
total charge
that
passes
through the wire from
t
= 0 to the time the
current has diminished to zero.
Answer in units of C.
003(part1of2)10.0points
The quantity of charge passing through a sur
face of area 1
.
73 cm
2
varies with time as
q
=
q
1
t
3
+
q
2
t
+
q
3
,
where
q
1
= 2
.
1 C
/
s
3
,
q
2
= 6
.
1 C
/
s,
q
3
= 6
.
8 C,
and
t
is in seconds.
What is the instantaneous current through
the surface at
t
= 1
.
2 s?
Answer in units of A.
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 Spring '11
 MACKIE
 Physics, Electron, International System of Units, Electric charge, Wire

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