View
215
Download
0
Category
Tags:
Preview:
Citation preview
Good Luck!
Exam 1 ReviewPhys 222 – Supplemental InstructionTUESDAY SESSION AS NORMAL – Q AND A
THURSDAY SESSION CANCELLED TO ACCOMMODATE EXAM REVIEW
Exam Overview
About 1/3 of the problems will stress conceptual understanding Don’t waste too much time on these Think carefully!
Remaining 2/3 will be numerical problems to test ability to apply these concepts Know your formula sheet Rule out wrong answers
25 + 2 Questions, 2 hours (4.4 minutes/problem)
Prepare yourself
Practice Problems!! Practice tests (11 of them, with solutions)
It’s really easy to think you understand a concept, but then find out you can’t solve a problem on it.
If you miss a problem, read the solution, then do it again later without the solution.
Old quizzes (make sure you understand mistakes)
Book problems (have answers in the back)
SI worksheets
Recitation problems
Concepts Textbook
Online Summaries
Lecture Slides
Do you know all the following?
Fluid StaticsDensity, pressureBuoyancy, surface tension
Archimedes' PrincipalFluid dynamics
Bernoulli’s equationPascal’s law, continuity equationLaminar flow
Electric ChargeCoulomb’s lawCharged objects’ behaviorConductors, Insulators, Polarization
Electric Charge InteractionElectric field, field linesDipoles, dipole momentFlux
Integral RepresentationGaussian RepresentationApplying Gaussian surfaces to objects
Electric Potential(vs) Electric Potential EnergyEquipotential Diagrams
Calculating potential at various pointsMovement of charge in the presence of a
potential.Relation to other types of energy
CapacitanceHow various changes affect capacitanceWhat are their usesConnections in circuits
Parallel vs seriesEquivalent capacitance
Dielectric additionsCurrent
Relation to other conceptsResistance
Connections, much like capacitors
Here we go!LOTS OF TEST PROBLEMS WITH TIPS SPRINKLED IN
Useful tip
Store variables in your calculator
Fluids!
Pressure = Force/Area (units depend on Area)
Archimedes principals Buoyant force equal to weight of liquid displaced!
Pressure at a depth:
Don’t forget the Po!
𝑃+𝜌𝑔𝑦+12𝜌𝑣2=𝑐𝑜𝑛𝑠𝑡𝑎𝑛𝑡
Classic problem: calculating velocity of water shooting out of a hole in a container.
If pipe changes diameter, changes in velocity can be related to changes in area with the continuity equation
In the case that the radius of a hole is very small, velocity simplifies
y is the depth at the hole
Electric Force
Electric Field
Electric Potential Energy
Electric Potential
Difference (voltage)
Divide by q
Field descriptions: Do not depend on recipient particle/charge.
Recipient charge -- q
Forces and energy: Do depend on recipient and emanating charge.
Emanating charge -- Q
Field lines!
Electric field lines go from + to -
Electric field lines end at negative charges.
Line density indicates field strength
Dipoles
(dipole moment) !! Notice: Dipole moment points from negative
to positive….opposite of the direction E points
Dipole Moment and Torque
𝝉 = ×𝒑 𝑬Know right hand rule for cross products!
This will help you eliminate wrong choices
Note that E is not the E produced by dipole. E is external
Torque minimums and maximumsMax when p perpendicular to E
U = -p E
Steps in solving GL Problems
Draw a picture. Pick a good Gaussian surface. Symmetry!
Write expression of integral flux notation. (if E || A then, EA)
Write expression for Gauss’s Law involving enclosed charge.
Set the expressions equal and eliminate variables to solve.
Capacitance and Energy
Wait, why are there three equations? If asked to calculate U, just use the one that has known
variables
If asked what happens to U when you double, half, etc. If the capacitors are stand alone, use Q^2 equation
If the capacitors are connected to constant voltage use V^2 equation
Combining components
Capacitors Resistors
AdditionT = X1 + X2 +…
Inverse Addition1/T = 1/X1 + 1/X2
+…
AdditionT = X1 + X2 +…
Inverse Addition1/T = 1/X1 + 1/X2
+…
Parallel
Series
HodgepodgeOF RELEVANT QUESTIONS
Recommended