Problem Statement:
28
A small electrical motor produces
10 W of mechanical power.
What is this power in:
a) N, m, and s units
b) kg, m, and s units
Schematic:
Assumptions/Approximations:
None needed
Physical Laws:
None needed
Properties/Sources:
Conversions:
None needed
1.00 J/s =
1.00 W
1.00 N*m =
1.00 J
1.00
1.00 N
Calculations:
(a)
10.00
N*m/s
(b)
10.00
Reasoning/Verification/Discussion:
None needed
kg*m/s
2
=
kg*m
2
/s
3
=
⋅
⋅
=
N
1
m/s
kg
1
J
1
m
N
1
W
1
J/s
1
)
W
10
(
2
W
=
⋅
=
J
1
m
N
1
W
1
J/s
1
)
W
10
(
W
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Problem Statement:
52
A university campus has
200 classrooms and
400 faculty offices.
The classrooms are equipped with
12 fluorescent tubes,
each consuming
110 W, including the electricity used by the ballasts.
The faculty offices, on average, have
0.5 as many tubes.
The campus is
open
240 days per year.
The classroom and faculty offices are not occupied an average of
4 hr/day, but the lights are kept on.
If the unit cost of
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 Spring '09
 n/a
 Problem Statement, Solar cell, unit cost, energy savings, FACULTY OFFICES

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