VCE Physics Question Thread!

[CarrymetoUni]

I've been trying to figure this question our for a while but for some reason I keep getting some stupid quadratic.
Robert flips a coin at a velocity of 3m/s and as it comes back, he fails to catch it resulting in it falling down an 8m deep well. How much time does it take for the coin to fall down the well.

[jakesilove]

I've been trying to figure this question our for a while but for some reason I keep getting some stupid quadratic.
Robert flips a coin at a velocity of 3m/s and as it comes back, he fails to catch it resulting in it falling down an 8m deep well. How much time does it take for the coin to fall down the well.

Hey! So, if we ignore air resistance, the coin should move up and down in a perfect parabola. This means that, when it reaches the point at which it was originally flipped, it will be travelling at exactly 3m/s, but in the opposite direction! You can use formulas to prove this, but there really isn't any need; it's sort of intuitive.

Now, we can use the equation



to find the time! Just sub in 8m for delta y, 9.8 for a and 3m/s (initial velocity) for u. Solve the quadratic, and you're done!

Jake

[lzxnl]

I've been trying to figure this question our for a while but for some reason I keep getting some stupid quadratic.
Robert flips a coin at a velocity of 3m/s and as it comes back, he fails to catch it resulting in it falling down an 8m deep well. How much time does it take for the coin to fall down the well.

You're going to get a quadratic, like it or not. Try not to fear them.

[bedigursimran]

Hey guys! In Young's double slit experiment, what does decreasing the slit width do to pattern(as in the spacing) when compared to decreasing slit separation?

Thanks

[sweetiepi]

Hey guys! In Young's double slit experiment, what does decreasing the slit width do to pattern(as in the spacing) when compared to decreasing slit separation?

Thanks

Hey! Decreasing slit width will cause the fringe spacing/pattern to come closer, whereas increasing the slit width will bring the fringe spacing/pattern out (or more spaced out).

[bedigursimran]

Hey! Decreasing slit width will cause the fringe spacing/pattern to come closer, whereas increasing the slit width will bring the fringe spacing/pattern out (or more spaced out).

Consise and helpful! Thanks 

[lzxnl]

Hey! Decreasing slit width will cause the fringe spacing/pattern to come closer, whereas increasing the slit width will bring the fringe spacing/pattern out (or more spaced out).

You have it the wrong way around. If your slit width decreases, then for a given spacing, your path difference decreases. To maintain the same path, and thus phase, difference as well between the two slits, the pattern needs to widen.

[sweetiepi]

My bad! D: (although the explanations from my textbook seem to agree with what I said, haha... unless I'm half blind )

[HopefulLawStudent]

For the attached question, is the average EMF even 1.6V? I can only get 0.16V.

[HopefulLawStudent]

Also, could someone please help me with this question (follow on from the last question)? I get that we use F=nBIL but the answers have 0.004 as their value for B... where do they get that value from??

[FallingStar]

Also, could someone please help me with this question (follow on from the last question)? I get that we use F=nBIL but the answers have 0.004 as their value for B... where do they get that value from??

Sorry HLS, I can only answer this part of your questions.
 

1. Find Area



2. Using the flux formula, find B




Mods: I'm still kinda new to Latex, so can you please correct anything I haven't done properly.

[Adequace]

Anyone done the 2015 TSSM exam yet? Just marked it, i shit the bed real hard, wasn't even a hard exam but I made so many mistakes. Feel like smashing my face against my desk, for real.

[HopefulLawStudent]

Sorry HLS, I can only answer this part of your questions.
 

1. Find Area



2. Using the flux formula, find B




Mods: I'm still kinda new to Latex, so can you please correct anything I haven't done properly.

Gah. I'm so silly. Thank you.

[HopefulLawStudent]

Heyyy would love it if you guys could please help me with this question.

Why is the answer clockwise? The current is going from A to B, right? So using our RH slap rule, with my thumb pointing into the page and my fingers pointing toward south, I get down so shouldn’t the answer be anticlockwise?

We’re later told that the turbine’s coil is connected to an output circuit via slip rings and asked whether it is the set up of an alternator or a generator. Why is is it a generator? If slip rings are used, isn’t it an alternator?

[MB_]

Would someone be able to summarise the key ideas and differences between DC and AC generators?