VCE Physics Question Thread!

[KiNSKi01]

thankyou kind person 

Just found out the reason I had trouble was because the solution Vic Physics provided was highly confusing (as per usual)

[minhalgill]

hi,
just wondering when we use which version of plancks constant?
thanks

[KiNSKi01]

Doesn't matter which version you use as long as you can keep track of which one you are using 

Personally, I always use the 6.63 x 10^34 J and convert if necessary to eV when I arrive to my final answer. (just divide by charge of electron). In some cases this wastes a very tiny bit of time but at least I am more confident that I won't make a stupid mistake as I always consider which units the answer is required to be in

[Bri MT]

hi,
just wondering when we use which version of plancks constant?
thanks

Just match up the units to what you're doing.  Eg. If you're trying to find the answer in Joules use the joules one. 

[minhalgill]

are 'further electronics' and 'materials and their use in structure' in the study design?

[sweetiepi]

are 'further electronics' and 'materials and their use in structure' in the study design?

Materials and their use in their structure was part of the 2002-2016 study design.
Pretty sure the same goes for further electronics.

So no, not in current SD as far as I am aware.

[minhalgill]

in part (a) why cant we just take the acceleration of m1 as equal to the acceleration due to gravity of block m2?

in question 1 (b) (one with the wagon and the engine) we take into account the frictional backwards force, yet in the question 1 (b) with the locomotive and the two trucks) we dont take into account the frictional force. why is that? it doesnt state anywhere in  the question that theres no frictional force

thanks

[KiNSKi01]

Because gravity isn't the only force acting on m2

All you have to do for this question is consider the whole system and do F=ma

F= 1 x 9.8 N (gravitational force) *tension is effectively zero if u consider the whole system
m=  1+ 4 kg
a= ?

Then you just solve for a 

It is important you clearly show in your working whether you are considering the whole system, m1 or m2

[minhalgill]

when finding the tension in T2 in part (b) why do we take into account the forces acting only on the first and second logs, why dont we take into account the driving force of the truck?

In another question in the marking scheme, theyve said there is tension and the gravitational weight force acting on the ball, yet they havent drawn tension in, so are we supposed to draw it in or not?

[KiNSKi01]

Hey can someone please give a succinct summary of the key differences we need to know about the double-slit and single-slit experiments

[minhalgill]

why cant we convert to rms voltage of the waveform first, and then find the input voltage?

thanks

[Bri MT]

when finding the tension in T2 in part (b) why do we take into account the forces acting only on the first and second logs, why dont we take into account the driving force of the truck?

In another question in the marking scheme, theyve said there is tension and the gravitational weight force acting on the ball, yet they havent drawn tension in, so are we supposed to draw it in or not?

If I take an elastic band (nothing attached) and drag it through the air it will have no tension. If I then attach a weight to one end and hold that end to drag it through the air there will still be no tension. If I drag it through the air holding the side NOT attached to the weight there will tension and my band might snap.

The point isn't how fast the truck is going, the point is that the bit of rope attached to the log wants to slow down and the side of that rope that's attached to the truck doesn't want to do that. Btw, there is a net force of 0 on the truck. We know this because of "constant speed"

Could you show the second question? Whether you draw it in will likely depend on what the question is asking.

[minhalgill]

In this question 5 why cant we convert the RMS voltage to Peak Voltage first and then use P=IV?

also, in question 7 wont the mass of the electron travelling be different from the mass of an electron at rest?

[minhalgill]

hey,

in this question i dont get why theyve drawn a reflected ray inside the glucose, as the angle of incidence is less than the critical angle? do we always draw the reflected ray?

[S200]

hey,

in this question i dont get why theyve drawn a reflected ray inside the glucose, as the angle of incidence is less than the critical angle? do we always draw the reflected ray?

You literally asked the same thing 10 days ago.

If you have ever done a practical with a light box, you'll see that some portion of the light can be reflected, as well as refracted.
Similar to seeing a double image when you are under water in a pool...

EDIT: Alternatively, the paper is suffering diplopia...