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physics 6B midterm
| Question | Answer |
|---|---|
| What is the conversion from Celsius to Kelvin? | C+273.15 =K |
| What is the conversion of Fahrenheit to Celsius? | (F-32)(5/9) = C |
| What is the equation for the relationship between n, N, and Na? What do each represent? | n=(N/Na), where n = # of moles, N = # of particles, and Na = Avogadro's number. |
| What is the value for Avogadro's number? | Na = 6.022 * 10^23 |
| What is the difference between heat (Q), Thermal Energy (Eth), and temperature? | Q is the flow of energy input/output from a system. Eth is a sum of the kinetic energies of the particles in a system. And Temp is a measurable quantity related to the kinetic energy of particles. |
| What is the alternative form of Vrms that we learned in class? | Vrms= square root of (3RT/M), where M= molar mass |
| What relevant equation from class is kinetic energy equivalent to? | 1/2mv^2 = 3/2(Kb)(T) |
| What are the units for pressure (as p=F/A)? | N/m^2, aka 1 Pa |
| What is the equation for heat transfer? | Q = m*c*(change in T) "mcat" |
| What is the equation for phase transition? | Q = +/- m*Lf,v ...[where Lf = latent heat of fusion, aka melt/freeze; and Lv is for vaporization, aka boil/condense] |
| Is energy transfer positive or negative if E enters the system? (from the system's point of view) | E is positive if it enters the system, and negative if it exits the system |
| During a phase transition (boiling, melting, freezing, etc) what is the change in temperature? | Change in T = 0 during a phase transition |
| What is the equation for linear thermal expansion? | Change in Length = (alpha)(initial L)(change in T), where alpha = coefficient of linear expansion |
| How is efficiency measured? | (work you get out of it)/(Qh, the work you had to put in) |
| Explain the relationship between Qh, Qc and Work output. | Qh is the heat added to the system; Qc is the heat removed from the system. Qh = Work output + Qc in a heat engine. |
| What is the equation for Qh in a heat pump? | Qc + Work input = Qh |
| What is the equation for COP (coefficient of performance) in a heat pump? | COP = Qc/work input = what you get / what you pay |
| What are the names for constant volume, constant pressure, constant temperature, and Q=0 processes? | Constant volume = isochoric. Constant pressure = isobaric. Constant temperature = isothermal. 0Q = adiabatic. |
| What is the work expression for an isochoric process? | W = 0 for isochoric process. |
| What is the work expression for an adiabatic process? | W = change in Eth |
| What is the Q expression for an isochoric process? | Q = change in Eth |
| What is the Q expression for an isobaric process? | Q = (change in Eth) - W |
| What is the Q expression for an isothermal process? | Q = -W, or (initial p)*(initial v)*(ln(vf/vi)) |
| What is the Q expression for an adiabatic process? | Q = 0 |
| What expression do we use for mass instead of Fg=mg in fluid dynamics? | Fg= (ro)*v |
| What is the equation that relates net Fy and buoyancy force? | net Fy = Fb - Fg = m*(acceleration in y direction)... aka, (ro of fluid)*v*g - (ro of mass)*v*g |
| What does "ro" represent in fluid dynamics? | ro = m/v, the mass density. Units are kg/m^3 |
| What is the equation for pressure at depth h? | (p of air) + (p of fluid)*g*h |
| What is the equation for temperature in a process with a constant variable? | T=PV/nr |
Created by:
clownestate