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I think he meant current.

Me too xD

v2/r = acceleration in circular motion. If you subbed in m you may have gotten it wrong. Reasoning: F = ma F = (mv2)/r equating, v2/r = a

Speed changes because the gravitational field slows it down as it drags it in, but due to the slingshot effect, as the probe leaves the planet, it gains some of the planet's orbital/rotational velocity. Due to the conservation of momentum, this means that the velocity of the PROBE changes, and...

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Multiple choice answers

The answer to 4 is D, as all other quantities except for horizontal velocity are different. Therefore, they fall vertically at the same rate, hitting the ground simultaneously and land with different Resultant Velocities, as their horizontal velocities are different.

Thank you! If I do, I hope my textbooks end up being the most useful!

About 15, I realised also that it goes from Positive to Negative but then I looked at Q and thought that there's no way that it could be zero, as there is still some magnitude of electric field at that point.

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But if you look carefully at the question it says force F on WIRE AB, so that's how you have to go about it.

Yeah that was pretty generous. I couldn't believe my eyes hehe. Also, none of that social impact nonsense, just straight forward stuff that really is PHYSICS.

What is the Force then? This was one of my stumpers.

Nope, carefully look at the direction of the current between A and B. Draw the direction. Now draw the direction of the magnetic field lines (N to S) You'll see they're always perpendicular.

Oh boy, so many interpretations, but so far I'm on jackson's side of things xD

So is Q9 C (R)?

Hi five same here, I just regurgitated stuff from previous questions too.

kthanks :)

Thanks for the explanation :D

That being said, I still think the answer is A. Anyone care to explain it to me?