quirky questions

Question 1

the allan question. what is the fundamental understanding you need to get from this?

(2 resistors in parallel + 1 resistor in series)

Answer 1

the voltage drop in a parallel circuit is equal on both sides, therefore taking a top branch’s voltage drop and adding it to the final resistors voltage drop should equal total voltage from KVL (VT = v1 + v2)

Question 2

how would you answer a question asking you for the rate of flow of electrons

Answer 2

find current, then time

then Q = IT = coulombs/second

Question 3

ke and momentum questions

Answer 3

use simultaneous equations and other methods to isolate variables. simplify equations as much as possible.

Question 4

impulse questions.. what equation do we know?

Answer 4

Impulse = △P = Fnet△T = M△V

Question 5

tension question (1 mass on top, 1 mass pulling down)

Answer 5

to calculate acceleration, we know that the bottom mass is providing weight force - mg

however, when calculating F = ma, this m is the entire weight of the system, not just the bottom weight.

therefore m2g = m1 + m2 (a)

then use a to solve for tensions