Chapter 2: Mechanical Design
Chapter 2
Solutions
1
© 2021 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in
whole or in part.
, Chapter 2: Mechanical Design
P2.1: Give three examples of engineered products that must be circular in shape and explain
why. Any ball is not allowed as an answer!
Examples include:
DVD’s
CD’s
manhole covers
railroad advance warning signs
wheel (for flat roads)
axles
bullet cross-section (balanced for stable flight)
European speed limit sign
any shape with minimized arc length/surface area for given area/volume
optimized pressure vessel cross sections
US coin
lens (part of circle)
optimal nozzle/diffuser (no edge effects)
optimal capillary tube
optimal suction cup
traffic circle
thrown pot (on potting wheel)
2
© 2021 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in
whole or in part.
, Chapter 2: Mechanical Design
P2.2: Give three examples of engineered products that must be triangular in shape and
explain why.
Examples include:
yield signs
the triangle instrument
billiards rack
knife blade (cross-section)
supports for finishing wood (pyramids or cones, must come to a point)
splitting wedge
handicap ramp viewed from side (to meet code)
three equally spaced instances per rotation cam
30°-60°-90° or 45°-45°-90° drafting triangle
one of six identical pieces that can be assembled into a hexagon
chisel point
3
© 2021 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in
whole or in part.
, Chapter 2: Mechanical Design
P2.3: Give three examples of engineered products that must be rectangular in shape and
explain why.
Examples include:
A size (or any other standard size) sheet of paper
four equally spaced instances per rotation cam
football/soccer field (civil engineered)
US speed limit sign
US dollar bill
4
© 2021 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in
whole or in part.
Chapter 2
Solutions
1
© 2021 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in
whole or in part.
, Chapter 2: Mechanical Design
P2.1: Give three examples of engineered products that must be circular in shape and explain
why. Any ball is not allowed as an answer!
Examples include:
DVD’s
CD’s
manhole covers
railroad advance warning signs
wheel (for flat roads)
axles
bullet cross-section (balanced for stable flight)
European speed limit sign
any shape with minimized arc length/surface area for given area/volume
optimized pressure vessel cross sections
US coin
lens (part of circle)
optimal nozzle/diffuser (no edge effects)
optimal capillary tube
optimal suction cup
traffic circle
thrown pot (on potting wheel)
2
© 2021 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in
whole or in part.
, Chapter 2: Mechanical Design
P2.2: Give three examples of engineered products that must be triangular in shape and
explain why.
Examples include:
yield signs
the triangle instrument
billiards rack
knife blade (cross-section)
supports for finishing wood (pyramids or cones, must come to a point)
splitting wedge
handicap ramp viewed from side (to meet code)
three equally spaced instances per rotation cam
30°-60°-90° or 45°-45°-90° drafting triangle
one of six identical pieces that can be assembled into a hexagon
chisel point
3
© 2021 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in
whole or in part.
, Chapter 2: Mechanical Design
P2.3: Give three examples of engineered products that must be rectangular in shape and
explain why.
Examples include:
A size (or any other standard size) sheet of paper
four equally spaced instances per rotation cam
football/soccer field (civil engineered)
US speed limit sign
US dollar bill
4
© 2021 Cengage Learning. All Rights Reserved. May not be scanned, copied or duplicated, or posted to a publicly accessible website, in
whole or in part.
