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1 2
*1–12.
Evaluate each of the following to three significant figures and
express each answer in SI units using an appropriate prefix:
(a) (b)
(c) (2.68 mm)(426 Mg). 128 ms210.0458 Mm2>1348 mg2,1684 mm2>143 ms2,
SOLUTION
a)
Ans.
=15.9 mm>s
(684 mm)>43 ms =
684(10-6)m
43(10-3)s
=
15.9(10-3)m
s
Ans:
1–13.
The density (mass volume) of aluminum is .
Determine its density in SI units. Use an appropriate prefix.
5.26 slug>ft3
>
SOLUTION
Ans:
1 4
1–14.
Evaluate each of the following to three significant figures and
express each answer in SI units using an appropriate prefix:
(a) (212 mN)
2
, (b) (52800 ms)
2
, and (c) [548(10
6
)]
1>2 ms.
SOLUTION
Ans:
1–15.
SOLUTION
Using Eq. 1–2,
Using the SI system of units, show that Eq. 1–2 is a
dimensionally homogeneous equation which gives F in
newtons. Determine to three significant figures the
gravitational force acting between two spheres that are
touching each other. The mass of each sphere is 200 kg and
the radius is 300 mm.
Ans:
1 6
*1–16.
The pascal (Pa) is actually a very small unit of pressure.To
show this, convert to .Atmospheric
pressure at sea level is in
2
.How many pascals is this?14.7 lb>lb>ft
2
1Pa=1N>m
2
SOLUTION
Using Table 1–2, we have
Ans:
1 7
1–17.
Water has a density of 1.94 slug
>
ft
3
. What is the density
expressed in SI units? Express the answer to three
significant figures.
SOLUTION
Using Table 1–2, we have
1 8
1–18.
and (c) 435 MN 23.2 mm.>
(a) 354 mg(45 km) (0.0356 kN), (b) (0.004 53 Mg) (201 ms),>
SOLUTION
Evaluate each of the following to three significant figures and
express each answer in Sl units using an appropriate prefix:
18.8 GN>m
1 9
1–19.
SOLUTION
Aconcrete column has a diameter of 350 mm and a length of
2m. If the density of concrete is
determine the weight of the column in pounds.
2.45 Mg>m3,1mass>volume2
Ans:
2 0
*1–20.
If a man weighs 155 lb on earth, specify (a) his mass in
slugs,(b) his mass in kilograms,and (c) his weight in
newtons. If the man is on the moon, where the
acceleration due to gravity is determine
(d) his weight in pounds,and (e) his mass in kilograms.
g
m
=5.30 ft>s
2
,
SOLUTION
Ans:
2 1
1–21.
Two particles have a mass of 8 kg and 12 kg,respectively. If
they are 800 mm apart, determine the force of gravity
acting between them. Compare this result with the weight
of each particle.
SOLUTION
Ans:
