**SAT 2 Physics Discussion Thread Oct 2015**

Pauli exclusion principle anyone?

@didierdrogba Yes.

What did the elliptic orbital question ask?

It asked which of the following is true for a planet getting farther from the star it is orbiting:

1.Its velocity increases.(WRONG)
2.Its GPE increases(RIGHT)
3.Can’t remember but was RIGHT.

Part III was that the gravitational force decreases ^

@nhs897 Yeah. Then the answer is II-III, right?

^^You’re wrong. It was that gravitational potential energy increases.

Which light bulbs work after closing two of the switches?

@nhs897 Yeah. Then the answer is II-III, right?

I got all light bulbs worked after closing switches. Which one was true of electrons?

@gearsstudio So what is your answer? Gravitational Potential Energy increases because there is a minus sign before it. As the value of it decreases, it actually increases.(II is right) Velocity decreases.(I is wrong) Gravitational Force decreases.(III is right)

Also, what was he answer to the capacitor ones in the beginning of the test?

@gegri123 Yess true! And yess all light bulbs!
What did you guys get for the instrument in the box or rays?

@Shradheya410 Converging lens.

@gegri123 Only II and III were correct.

@asianfang For the capacitor ones;
First was the one with only the resistors.
Second was the one with only capacitors.

Was the greatest gravitational force and greatest KE the same satellite, one at the bottom?

@gegri123 wouldn’t it be convex mirror? Because it reflected?

same
3/4

@didierdrogba How could it have reflected them if the rays got to the other side of the optical device?

Which ones of the three options had conservation of momentum…
Also, which instruments do you need to calculate acceleration