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MECH 103 Review For Unit 1

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MECH 103 Review For Unit 1 MECH 103

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There was no study guide for this exam, so here are all the notes from this unit! :)
Introduction to Mechanical Engineering
John S Petro
Study Guide
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This 6 page Study Guide was uploaded by Notetaker on Thursday October 1, 2015. The Study Guide belongs to MECH 103 at Colorado State University taught by John S Petro in Fall 2015. Since its upload, it has received 93 views. For similar materials see Introduction to Mechanical Engineering in Mechanical Engineering at Colorado State University.

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Date Created: 10/01/15
Ch.2  Dimension o Measureable physical area o Word description - no number o Length o Area o Volume o Temperature o Time  Unit o A number describing how much of that dimension that exists o Defined by convention o Related to an accepted standard o Feet, meters o Cubic inches o Degrees Fahrenheit o Seconds, minutes, hours  SI System o Light intensity (J): cd (candela) o Electric current (I): amp  Engineering Notation o M is an integer multiple of 3 o Number of digits to the left of decimals point is 1, 2, 3, as needed to produce M as multiple of 3  547,300,000 m => 5.473 x 10^8 m (scientific)  547.3 x 10^6 m (engineering)  SI Prefix - 547.3 Mm  Conversions o Units on the left side must me equal to the units on the right side of the equation  Unit Systems o SI  F=ma  1 N= 1 kg 1m/s^2  N= kg m/s^2 o Brit Gray [USCS]  1 lb = 1 slug 1 ft/s^2  Slug= lb s^2/f o AES  1 lb= 1 lb m 32.2 ft/ s^2  When converting from lb mass to lb force -> Use gc= 32.2 ft lb m/lb s^2  1 lb = 1 lb m 32.2f lb s^2/s^2 32.2 ft lb m  1 lb mass = 0.454 kg  1 slug = 32.2 lb mass o USCU (brit gray)  lb= slug f/s^2 o Velocity  Change in distance/ change in time o Acceleration  Change in velocity/ change in time = change in distance/ t^2 Ch. 3  Force o F=ma  Weight o W=mg  Density o Mass/volume o M/L^3 o Slug/inch^3  Specific weight o Weight/volume o N/m^3 o Kg/m^2s^2  Specific gravity o Object density/density of water  Density of Water o 1g/cm^3 o 1 kg/L o 1000kg/m^3  Avogadro's Number (amount) o Na = 6.022 x 10^23 atoms or molecules/mole o Unit for very small things like atoms or molecules  Temperature o Rankine (absolute)  Freezing point: 492 o Kelvin (absolute)  Pressure o Force/area o SI system 2  Pascal = N/m  Pascal = N/m = kg (m/s )/m =kg/ms 2  mPa= N/mm 2  1 atm= air pressure at sea level  1 atm= 101,325 Pa o AES units  Psi o Atmospheric pressure o Hydrostatic pressure  Pressure on a submerged object in a fluid o Total pressure o Gas pressure  Temp scales and conversion o Convert from one temp scale to another o Use : F = 9/5 C + 32 o C= 5/9 (F-32) o Absolute scales  K = C + 273  R = F + 460 o Change in temp  70 F ---> 500 F => 430 F  430 F 1 C 1.8 F  238 C temp change  Measuring pressure o Absolute - perfect vacuum as reference point o Psia o Gauge - uses the local atmospheric pressure as the reference point o Psig  Gas pressure o Ideal gas law : PV= nRT o (pressure)(volume)= (amount of gas in a closed container - units moles)(universal gas constant)(temp in absolute temp scale - K or degrees R)  R = 8314 (Pa L)/mole K  R = 0.08206 (atm L)/mole K o mass = (n) (mol wt) => n= m/ mol wt  Mass= (moles)(g/mole)  1 of mole of O2 atoms = 32g/mole  1.5 moles 32g Mole m= 48 g   Energy o Base dimensions o 2 2 M L / T o SI N m o AES lbfft o Work - "energy in transition" o Potential energy  PE= mgh  Energy + Work o Energy transferred by a force o Energy in transition o *force thru a distance  Find the density of gold  S.g = 19.3  


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