Physics P4 Discussion

[Amel Fatima]

In the Simple harmonic motion question... Wat was the displacement? N hw did u calculate it?

 

[larina]

which varient??? 41 or 42?

 

[jackrabbit]

In 42, it was 2cm. Use both equations for KE and PE to equate x, which is the displacement

 

[Amel Fatima]

I got 1 point something :/

 

[jackrabbit]

Ok so Physics 42,
1) was the displacement in the shm question 2cm?
2) In the x ray attenuation question in Section B, what were the 2 answers, if you guys are unable to remember it,( which is most likely the case) could you atleast tell me the method? as in was it 1/e-attenuation coeffecient*length , and was the second answer( where the ray passed through bone as well) a much larger number than the first one?
3) Output of OPamp in section B, did we have to draw another wave, which is out of phase by 180 degrees from the input voltage wave, and with an amplitude of 5V?( because Vin was connected to the inverting input)
4) aaand the melting of ice at 0degrees? what was the explanation for that?
5) Lastly, the magnet question, what was the direction of the magnetic force? and why? also what happens to the force when an RMS current is present in the wire?

 

[Pals_1010]

I got 1 point something :/

You got 1.98 cm?

 

[h.b]

i have A in p2 A in p3 and B in p1 if i get a B in p4 and A in p5 do u guys think i can maintain my A grade??? I think i will av 30 marks deduction in my p4 i messed up real bad=/ also can some one tell me what equation was to be used in the Shm question was it 1/2w^2 x^2=mgx????

 

[hash94]

and abt the ratio in the applications section?

EDIT : X-Ray attenuation through bone and muscle!

 

[Prince III]

i have A in p2 A in p3 and B in p1 if i get a B in p4 and A in p5 do u guys think i can maintain my A grade??? I think i will av 30 marks deduction in my p4 i messed up real bad=/ also can some one tell me what equation was to be used in the Shm question was it 1/2w^2 x^2=mgx????

if you are sure you only lost 30 marks in p4 then that's A bro
and over all will be A

 

[h.b]

if you are sure you only lost 30 marks in p4 then that's A bro
and over all will be A

ameeeen...thank you soooo much =D

 

[h.b]

I got 1 point something :/

i got 1.3 sumin=/ but its wrong should have been sumin around 2.6

 

[h.b]

and what about abt the Vout graph in the application portion question 1 i think? i drew the graph same as the Vin graph that was provided but with amplitude 5V since that was the voltage of the battery to the op-amp

 

[Pals_1010]

In 42, it was 2cm. Use both equations for KE and PE to equate x, which is the displacement

You got 2 cm exact or by rounding off because I equated KE and PE also, and i got 1.98 cm?

 

[Amel Fatima]

and what about abt the Vout graph in the application portion question 1 i think? i drew the graph same as the Vin graph that was provided but with amplitude 5V since that was the voltage of the battery to the op-amp

yes the amplitude was 5v but the graph was inverted!

 

[Ahmadbasharat]

and what about abt the Vout graph in the application portion question 1 i think? i drew the graph same as the Vin graph that was provided but with amplitude 5V since that was the voltage of the battery to the op-amp

but the graph was not sinosudioal it is rectangular..

 

[rahultaneja2010]

Hold on a minute .... Why was the output 5 again ? We weren't even told if it was saturated, neither we're we told the gain .... It Wud still be a curve with 180 degrees out of phase .... I. E inverted

 

[zulqarnain]

v we

Hold on a minute .... Why was the output 5 again ? We weren't even told if it was saturated, neither we're we told the gain .... It Wud still be a curve with 180 degrees out of phase .... I. E inverted

v wer told that it was an ideal op amp!!

 

[zulqarnain]

wat was the variation in balanc reading?

 

[zulqarnain]

the

and abt the ratio in the applications section?

EDIT : X-Ray attenuation through bone and muscle!

the 1st was 1/0.52 nd the second i gues 39 ..urz??

 

[OakMoon!]

The Vout graph was something like this: