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Mechanic Solution

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Sandra Watson
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Engineering Mechanics – Statics Chapter 1
Problem 1-1
Represent each of the following combinations of units in the correct SI form using an
appropriate prefix:
(a) m/ms (b) μkm (c) ks/mg (d) km⋅μN
Units Used:
μN 10 6 −
= N
μkm 10
− 6
= km
Gs 10
9
= s
ks 10
3
= s
mN 10
− 3
= N
ms 10
− 3
= s

Problem 1-2
Wood has a density d. What is its density expressed in SI units?
Units Used:
Mg = 1000 kg
Given:
d 4.70
slug
ft
3

Problem 1-3
Represent each of the following combinations of units in the correct SI form using an
appropriate prefix:
(a) Mg/mm (b) mN/μs (c) μm⋅Mg

Problem 1-4
Represent each of the following combinations of units in the correct SI form: (a) Mg/ms, (b)
N/mm, (c) mN/( kg⋅μs).

Problem 1-5
Represent each of the following with SI units having an appropriate prefix: (a) S1, (b) S2, (c) S3.
Units Used:
kg = 1000 g ms 10
− 3
= s kN 10
3
= N
Given:
S1 = 8653 ms
S2 = 8368 N
S3 = 0.893 kg

Problem 1-6
Represent each of the following to three significant figures and express each answer in SI units
using an appropriate prefix: (a) x, (b) y, and (c) z.
Units Used:
MN 10
6
= N
μg 1 10 6 × − = gm
kN 10
3
= N
Given:
x = 45320 kN
y 568 10
( × 5) = mm
z = 0.00563 mg

Problem 1-7
Evaluate ( a⋅b)/c to three significant figures and express the answer in SI units using an
appropriate prefix.
Units Used:
μm 10 6 −
= m
Given:
a = (204 mm)

b = (0.00457 kg)
c = (34.6 N)

Problem 1-8
If a car is traveling at speed v, determine its speed in kilometers per hour and meters per second.
Given:
v 55
mi
hr

Problem 1-9
Convert: (a) S1 to N⋅m , (b) S2 to kN/m3, (c) S3 to mm/s. Express the result to three
significant figures. Use an appropriate prefix.
Units Used:
kN 10
3
= N
Given:
S1 = 200g lb⋅ ft
S2 350g
lb
ft
3
=
S3 8
ft
hr

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Mechanic Solution

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