I think that question will be removed or something. Since when did the BOS punish looking overly into the question? (although you could answer that question with, since always)i think ure looking too much into the question, i think their looking for u to say that g cant be sheilded, hence C is correct
It is NOT correct as the work done is from infinity to those points. In that answer the assumption is horses for courses and could possible refer to zero as the centre of earth.
Either way whoever wrote those answers has no clue how to write proper English. The real answer is the a bit of C and a bit of D as C has the word "difference" stated the correct part but fails to mention from infinity... whilst D states a very large distance away but fails to mention geosynchronous and difference.
What a crap of a question... and then A comes in and possibly based on correct terminology could be the BEST answer... LOL but C and D is where it should have been.... arghhhhhhhhhhhh :burn:
AMBIGUOUS MC answers NSW BOS - PHYSICISTS SAY NO!!!!!
earth does apply a force on both the sun and the moon and in doing so, changes the NET force experienced by either bodies respectively. however, the force that the sun exerts on the moon and vice versa, does not change - it will always be the same value as determined (or approximated if you wanna be a dickhead or pedantic about it) by newton's law of gravitation. it does not void any theory at all.its a concept question which i put down c first as well but i changed it due to the hard fact i thought of in my mind. consider the case where no earth exist. the force would b only caused due to gravitational attraction. now u put earth in the middle. if c was 2 b correct then ur saying earth does not apply a force on either sun or the moon as the force is constant and hence ur saying newton's theory is totally wrong. so ur basically challenging newton, the greatest sciencest ever and his work. if u still want to say c is correct then u have 2 abolish the whole newtonian physics and it will mean sun would not exert a force on the moon in the first place. if bos said c was the correct answer then i would simply ask them r they saying newton is wrong coz it comes down to tat matter. (and yea i'm a freak at physics) (though newton was abit wrong at his law of universal gravitation but tats only if u take in extremities which is explained by einstein and his general relativity in uni which i have already learnt and i'm yr 12 just 2 make things clear)
This is what I got too 760.26light years away...In that particular question you guys are talking about, it is definately t0, as it is YOUR frame of reference and relative to YOU it is not moving at velocity (hence t0)
Essentially the answer should have come out to be
tv = 170,001.70 years (t = d/s)
t0 = tv (1-(v^2/c^2))^1/2
t0 = 170,001.70(1-(0.99999^2)^1/2
t0 = 760.27y
If they were REALLY Jewish, they'd make it all multiple choice, and computer marked. LOL at the American SAT...waaaaaay too many equations
the board of studies is getting Jewish
equations are easier and cheaper to mark then reponses so there taking the easy way out and not testing students as they should be. ie on the theory
aside from that i didnt think it was too bad
just pissed off expecting to get asked questions to explain and discuss physics theory and ended up sitting a math exam