Solution Manual for An Introduction to Mechanical Engineering, 3rd Edition

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An’sSolutionsManualtoAccompanyANINTRODUCTIONTOMECHANICALENGINEERING,3RDEDITIONJONATHANWICKERTKEMPERLEWIS

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TableofContentsPreface………………………………………………………………………………………………………..viChapter2.........................................................................................................1Chapter3.......................................................................................................15Chapter4.......................................................................................................55Chapter5.......................................................................................................97Chapter6.....................................................................................................139Chapter7.....................................................................................................191Chapter8.....................................................................................................227

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Chapter 2: Mechanical Design1Chapter 2Solutions

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Chapter 2: Mechanical Design2Problem P2.1:Give three examples of engineered products that must be circular in shapeand 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)

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Chapter 2: Mechanical Design3Problem P2.2:Give three examples of engineered products that must be triangular in shapeand 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

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Chapter 2: Mechanical Design4Problem P2.3:Give three examples of engineered products that must be rectangular inshape 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

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Chapter 2: Mechanical Design5Problem P2.4:Give three examples of engineered products that must be green in color.Examples include⋅fake plant/turf (imitate actual plant)⋅John Deer product (branding)⋅Cameron Compressor (branding)⋅Green (traffic) light⋅European recycling bin⋅Kermit the frog paraphernalia (branding)

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Chapter 2: Mechanical Design6Problem P2.5:Give three examples of engineered products that must be black in color.Examples include⋅Background for one way signs and night speed limit signs⋅theater bins/supports (disappears in dark)⋅stealth fighter (better “bounce” characteristics)⋅ninja suit (stealth at night)⋅black paint⋅black ink⋅backing for solar water heating⋅negative electric cables

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Chapter 2: Mechanical Design7Problem P2.6:Give three examples of engineered products that must be transparent.Examples include⋅Contact lenses (over pupil portion)⋅glasses (spectacles)⋅(camera) lens (any tint causes loss of quality/information)⋅Microscope slide and slide cover

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Chapter 2: Mechanical Design8Problem P2.7:Give three examples of engineered products that have a specific minimumweight, but no specified maximum weight and specify the approximate minimumweight.Examples include:⋅Helium balloon holder (minimum weight will depend upon how many heliumballoons are being held)⋅non-wedge based door stop (minimum weight based on friction coefficient)⋅racecar (minimum weight based on racing regulations)⋅competition bike (minimum weight based on racing regulations)

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Chapter 2: Mechanical Design9Problem P2.8:Give three examples of engineered products that have to be precisely acertain weight, and provide the weight.Examples include:⋅balancing weight for car wheel⋅coins (weight used to count coins in some automated machines)⋅precious metal coins (weight dictates worth)⋅exercise weights (15 lb weight must be 15 lb)

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Chapter 2: Mechanical Design10Problem P2.9:Give three examples of engineered products that fulfill their designedpurpose by failing or breaking.Examples include:⋅saw stop mechanism (http://www.sawstop.com/)⋅crumple zone in car⋅bumper (foam insert) in car⋅bike helmet⋅frangible bullets (split up when they hit anything other than flesh) to protectbystanders⋅stress indicating paint has fluorescent dyes capsules that split under knowndeflections(http://www.newscientist.com/blog/invention/2007/10/stress-sensitive-paint.html)⋅Some meds are packaged in glass bottles that you break to open⋅Cover on a “pit trap” breaks when weight is applied⋅Fire suppression sprinkler detection device (solder connect melts or glass connectionshatters)

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Chapter 2: Mechanical Design11Problem P2.10:Give three examples of engineered products that are designed to work wellover a million times.Examples include:⋅Roads⋅Bridges⋅Engine components (if each Otto cycle is a “use”)⋅Fuses⋅Door hinges⋅3-D shutter glasses (the shutters)

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Chapter 2: Mechanical Design12Problem P2.11:List three products that can be used equally well by people with andwithout visual impairments and explain why.Examples include:⋅Silverware⋅Chairs⋅Drinking Cups⋅Headphones⋅Bed⋅Drawers⋅Emergency response necklace (one button, worn around neck to locate)http://inventorspot.com/articles/one_touch_911_dialer_calls_help_you_30719⋅Sight and sound cross walk guides⋅Fire alarm (day to day use, not installation and maintenance)⋅Automatic doors (and other motion detectors)

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Chapter 2: Mechanical Design13Problem P2.27:For the magnesium camera body shown, provide an explanation for whichprocesses you think were used in its manufacture and why.This was most likely manufactured using a die cast procedure because of the material andgeometric detail in the pieces including a number of inclusions. Certain features could havebeen machined, and some polishing/grinding operations may have been used.

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