Tuesday, November 9, 2010
Tues-Day 2
Physics - took the written-response part of the quarterly exam.
On the multiple choice part, look for questions regarding subtopics not covered as much on the written response such as:
Relative force of attraction problems involving two masses, m1 and m2 , at a distance, d, apart.
The class did not do well on that question on the Dynamics/Forces exam.
Go to the problems in the notes! Pick EASY numbers (1, 10, 100) in these questions and then use your answers to COMPARE the forces i.e. set up a ratio. If the original F is 100 N and the new F is 550 N, then the new force is 5.5 times the original F (just divide new force by the original force to get the ratio).
If you do not want to pick numbers, solve using the variables and simplify using F = (G m1 m2 / d^2); so anywhere you see (G m1 m2 / d^2) in your final answer, just replace that with F so that you can compare the forces.
Also expect "car chase" or "train crash" problems in which you solve for time or distance, using the motion formulas.
This test will also have questions from unit 1 on vectors.
On the multiple choice part, look for questions regarding subtopics not covered as much on the written response such as:
Relative force of attraction problems involving two masses, m1 and m2 , at a distance, d, apart.
The class did not do well on that question on the Dynamics/Forces exam.
Go to the problems in the notes! Pick EASY numbers (1, 10, 100) in these questions and then use your answers to COMPARE the forces i.e. set up a ratio. If the original F is 100 N and the new F is 550 N, then the new force is 5.5 times the original F (just divide new force by the original force to get the ratio).
If you do not want to pick numbers, solve using the variables and simplify using F = (G m1 m2 / d^2); so anywhere you see (G m1 m2 / d^2) in your final answer, just replace that with F so that you can compare the forces.
Also expect "car chase" or "train crash" problems in which you solve for time or distance, using the motion formulas.
This test will also have questions from unit 1 on vectors.
AP Chem - we discussed the difference between the quantum energy level diagram for Hydrogen and that for all other elements, noting that electron-electron repulsion causes the energy differences between sublevels of a given principAL energy level. For example, a 2s orbital electron repels and also partially "shields" or blocks a 2p orbital electron from experiencing a certain amount of the positive nuclear charge, thus causing the 2p electron to be at a higher potential energy.
We then showed how the Aufbau Principle, the Pauli Exclusion Principle, and Hund's Rule guides us in assembling the proper electron configurations and the proper orbital diagrams of the elements.
# posted by C @ 1:49 PM 
