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1.24.
Solve:
(a)
()
1 m
20 ft
20 ft
7.0 m
3 ft
==
(b)
5
1 km
1000 m
60 miles
60(miles)
1.0
10 m
0.6 miles
1 km
×
(c)
1 m/s
60 mph
60(mph)
30 m/s
2 mph
(d)
2
1 cm
10
m
8 in
8(in)
0.16 m
1/2 in
1 cm
−
1.26.
Solve:
(a)
We need kg/m
3
. There are 100 cm in 1 m. If we multiply by
3
3
100 cm
(1)
1 m
=
we do not change the size of the quantity, but only the number in terms of the new unit. Thus, the mass density of
aluminum is
3
33
kg
100 cm
kg
2.7
10
2.7
10
cm
1 m
m
−
×=
×
(b)
Likewise, the mass density of alcohol is
3
g
100 cm
1 kg
kg
0.81
810
cm
1 m
1000 g
m
=
1.46.
Solve:
A car starts coasting at an initial speed of 30.0 m/s up a 10
°
incline. 230 m up the incline the road
levels out to a flat road and the car continues coasting at a reduced speed along the road.
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This note was uploaded on 05/05/2008 for the course PHYS 141 taught by Professor Staff during the Spring '06 term at Cal Poly.
 Spring '06
 staff

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