Save
or

or

taken

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

focusNode
Didn't know it?
click below

Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size     Small Size show me how

# Physics A

### Formulas

What is the formula for internal energy? And the first law of thermodynamics? dU = Q + W
What is internal energy equal to? dEth + dEbond + dEatomic + dEnuclear
What is the formula for entropy, not at constant pressure? H = U + PV
What is the formula for change in entropy at constant pressure? dH = Q
What is the exact formula for work? Approximate formula for work? W = -der PdV or W = appx Pavg dV (at constant pressure)
What is the formula to calculate Q when there is no phase change? Q = deriv CdT or appx: CdT
What is the equation for the ideal gas laws? PV = nRT
What does Q represent? Q = Ebond + Etherm
What is the formula for entropy when the number of microstates is known? S = kb lnOmega
What is the entropy for the system? dS = Q/T
What is the formula for heat capacity? C = Q/dT
What is the formula for the heat capacity at constant volume? Cv = dEth/dT (if Q = Etherm)
What is the formula for the heat capacity at constant pressure and in the ideal gas model? Cp = Cv + R
What is the formula to calculate Etherm for a specific phase or number of molecules? Etherm = (#modes/molecule)(1/2) nRT
What is the formula for Etherm when the number of modes is known? Etherm/mode = (1/2)(Kb) T
What is the formula for Etherm when the number of moles is known? Etherm/mole = Na (#modes/molecule) (1/2)(Kb)T
What is the formula to calculate Etherm for a particular substance? Etherm = CdT
How do you calculate Ebond? Either add all the Ebond numbers together or refer to the PE on the pair wise graph
How do you calculate Ebond during a phase change? abs val Ebond = abs val (dMdHmelt) or abs val (dMdHvap)
What is the formula to calculate the change in kinetic energy? dKE = (1/2)m dV^2
What is the formula to calculate the change in gravitational potential energy? dPEgrav = mgdy
What is the formula to calculate the change in spring potential energy? dPEspring = (1/2)k dx^2
What number is represented by Na? Avogadro's number
What number is Kb represented by? 1.38 x 10^-23 J/K
What number is R represented by? Na x Kb = 8.31 J/Kxmol
How much does the mass change during a phase change? dm = Q/dH
How much does the temperature change during a phase change? dT = Q/dH
How do you calculate the kinetic energy of a spring mass? KEsping-mass = (1/2)mv^2
How do you calculate the potential eneryg of a spring mass? PEspring-mass = (1/2)ky^2
How do you calculate the magnitude of the attractive or repelling forces between two adams? Think pair-wise absval F = absval d(PE)/dr
How do you calculate the intermolecular Ebond between adams? -(total number of n-n pairs) x epsilon
How do you calculate the Etherm total? (total number of active modes) x (1/2)KbT
In a closed system what is the Entropy? dS is greater than or equal to 0
How do you calculate the number of modes? Estimate the number of modes then the formula is (#modes/atom)(#atoms)
Created by: 24rory

Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

• SPACEBAR - flip the current card
• LEFT ARROW - move card to the Don't know pile
• RIGHT ARROW - move card to Know pile
• BACKSPACE - undo the previous action

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
 "Know" box contains: Time elapsed: Retries:
restart all cards