basketball1

it was charge to mass...i put positron also

basketball1

and i think the answer to the rocket at 0.9c was less than d but greater than 0. This is because when objects travel close to the speed of light, length contracts

Sci-Fry

I was thinking of putting D due to conservation of momentum, but then I didn't!

Thanks basketball1. The boat/rocket question and the relativity one were the main to I was unsure of. Hopefully I haven't made too many more mistakes...

nick321

When you are pushing with a stick while standing on a boat, you have a direct connection with the coast. That is clearly not the case with a rocket 99% of the time (one centimeter in the air? No connection!).

oceanangel

The 0.9c one was smaller than d but greater than zero
I think It was charge mass.. I put the one with 1:1 ratio...

basketball1

also in the wave picture at the beginning of the test, was A the point where the wave was traveling to the top of the page?

nick321

Less than D, but greater than zero. To be exact: D sqrt(1 - 0.9^2)

basketball1

and the rocket one is tough, it really just depends on how it was worded, i just know that rocket propulsion deals with newton's third law...

oceanangel

yeah what did that wave one mean??

Pikafu

Spaceship problem - spaceship traveling (9/10)c measures the distance to a planet its traveling to vs. the distance we measure to that planet.

I put that the distance measured by the spaceship is shorter. Can anyone verify?

basketball1

i have no idea, so weirdly worded, i just picked the hightest point, which was A, as the wave traveling to the top of the page

oceanangel

When you travel close to speed of light, length contracts

basketball1

it is shorter and still greater than 0

oceanangel

I forgot what I put for the wave question.. Technically A would be mving down already since it's the highest.. Bad question

Sci-Fry

I put B. The wave was travelling to the right and the only point which had an upward motion to the left of it was B.

A was at the maximum displacement, meaning that it was about to move down at that instant.