ME 101
terms of ME 101 up to 10-4-2008
Terms
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- formula for KE
- KE=(1/2) mv^2
- two ways to transfer energy across a system boundary
- Heat,Work
- the basic units of ___, ___, and ___ are all the same
- work, heat, and energy
- PE
- potential energy
- Calorie(kilocalorie)
- 1000 calories
- Kelvin-planck statement ( heat engines)
- "it is impossible to convert heat into 100% work"
- base electrical current unit
- ampere
- Sensible energy
- associated with molecular motion
- potential energy formula
- U g=mgh=mass x gravity x height
- watt
- 1 watt= 1 (J/s)= 1 (Nm/s)
- unit of foce is
- newton
- slug formula
- m=(w/g)=(weight in lbf)/g=slugs
- heat
- Q, energy that is transfered by a difference in temperature
- SI system
- Newtons, Joules
- KE
- kenetic energy
- ECU unit for heat, work, and energy.
- work=foot-pound force=ft-lbf
- ECU mass unit
- slug
- some materials produce ___ directly by means of the ___ effect when they absorb ____ energy
- photovoltaic energy, seeback, radiant
- another ECU heat unit
- BTU (british thermal unit)
- U(4 kinds)
- internal energy( sensible, latent, chemical, nuclear)
- unit for work, heat, and energy
- joule
- efficienccy
- W/Q h
- when evaporated, _____ cubic inch of water becomes _____ cubic foot of steam
- 1,1
- the freezign point of water on the celcius scale is ___. and the boiling point is ___
- 0, 100
- Newton (N)
- force
- latent energy
- associated with phase of the material
- chemical energy
- due to bond forces
- power defined as
- time rate of change of energy or work
- newton's second law of motion
- F=MA
- one newton
- 1kg x 1 m/s^2
- foot pounds
- work
- first law of thermodynamics
- Q in- Q out + W in- W out=U 2- U 1 + (m/2)(acceleration2- acceleration1) +mg(Z 2- Z 1)
- base mass unit
- kilogram
- calorie
- heat that raises 1 gram of water one degree Centigrade
- joule (J)
- work
- real processes always involve loss, also called
- irreversibilities
- formula for work
- work=force x distance
- adiabatic
- no heat transfered
- first law of thermodynamics
- conservation of energy
- base time unit
- second
- celcius converted to kelvin
- Kelvin=Celcius+273.16
- work
- a force moving through a distance
- convert to rankine
- TR=Temp F+ 460
- (dE/dt)
- first derivative with respect to time of the energy
- acceleration of gravity in feet/s^2
- 32.2 ft/sec^2
- efficiency
- stuff you want(amount of useful work)/what you have to pay for (heat from high temp reservoir)
- SI power unit
- watt
- Clausius Statement (refrigerators)
- "no fridge is 100% efficient"
- three ways to store energy in a system
- U,KE,PE
- 1kW
- 1000W
- base temperature unit
- kelvin
- pound mass
- mass
- horsepower formula
- 550 (ft-lbf/s)
- isothermal
- no change in temperature
- efficiency
- 1-(Q L/ Q h)
- ESC power unit
- Horsepower (Hp)
- second law of thermodynamics
- the efficiency of any real device must be less than 100%
- pound force
- force
- nuclear energy
- due to nuclear attraction
- 1 joule is
- 1 newton x 1 meter
- U g
- gravitational potential energy
- units of power
- power=Energy/Time
- carnot cycle
- most efficient cycle possible for converting a given amount of thermal energy into work, or for using a given amount of work for refrigeration purposes
- work formula
- force x distance = work
- BTU
- raises a pound of water 1 degree F
- base optical radiation unit
- candela
- base length unit
- meter
- some materials produce ___ directly by means of the ___ effect when they absorb heat
- thermo-electricity, peletier
- mass definition
- fundamental amount of material
- work
- W, energy transfered by any other mode