physics paper 3, harder than hard

[shafayat]

hw much u expectin?
65+?

not this time bro ! maybe 58-64

 

[kboss]

not this time bro ! maybe 58-64

im expecting the same and to think i used to get 75+ in mocks...better days they were.....

 

[n0n4m3]

Anyone got back the question paper yet?

 

[Zeus]

I am expecting between 55-65. I couldn't do the last part of the light bulb and fuses (4) marks. I also couldn't recognize the correct wave, CD. I gave CE. I am hoping marks for explanation though. Because the explanation is same. Refraction takes place in less denser medium ( shallow water), smaller wavelength. What do you guys reckon the grade threshold will be ? I am hoping for it to be 45 or 48. I got 2 marks wrong in paper 1. Hoping for the best in paper 6.

 

[shafayat]

b btw the fuse n bulb question . the answer is 32

 

[Zeus]

What did you guys get for power dissipated ?

 

[kboss]

b btw the fuse n bulb question . the answer is 32

its 8 LOL
i think you forgot to subtract 32 from 40

 

[shafayat]

What did you guys get for power dissipated ?

dun remember but (I^2 R)

 

[shafayat]

its 8 LOL
i think you forgot to subtract 32 from 40

I wrote 8 but my teaachers say its 32 :[

 

[kboss]

What did you guys get for power dissipated ?

180

 

[kboss]

I wrote 8 but my teaachers say its 32 :[

if 32 bulbs were gone i think the current flowing would be much much more than 0.9A

 

[Zeus]

Power dissipated 180 :|. Dude I don't thing thats right. The current was 0.75 A. They asked for power dissipated in ONE LAMP. The power in one lamp was 6 volts. 40 lamps- 240 volts. In series voltage is shared, so yeah.

 

[kboss]

Power dissipated 180 :|. Dude I don't thing thats right. The current was 0.75 A. They asked for power dissipated in ONE LAMP. The power in one lamp was 6 volts. 40 lamps- 240 volts. In series voltage is shared, so yeah.

then im not sure

 

[kboss]

I think it was 4.5 volts That what I gave. if you multiply 4.5 x 40= 180V . Thats the total power dissipated. I might just get more than 61. (6).

im really nt sure abt anything in the paper...
what arrows u put for the electric field one i didn't get that question at all
so i just put some arrows going upwards (random guess)

 

[Zeus]

I got that one wrong. Its gonna be arrows going inwards. if it was positive, then it would have been outwards. This paper didn't give us the time to review back. Don't know this, okay fine, MOVE ON!

 

[shafayat]

I think it was 4.5 volts That what I gave. if you multiply 4.5 x 40= 180V . Thats the total power dissipated. I might just get more than 61. (6).

dude its POWER dessicipated .. how r u measuring it in volts ?

 

[kboss]

I got that one wrong. Its gonna be arrows going inwards. if it was positive, then it would have been outwards. This paper didn't give us the time to review back. Don't know this, okay fine, MOVE ON!

what abt the second wave question?
i just put the depth of the water became level throughout or something like that....
some guys in my class said to tilt the tank....didn't make sense to me though

 

[Zeus]

sorry man, 4.5 watts. :/ I took the time as one second.

 

[Daya]

What was the answer for the charge on the sphere after it was earthed?

 

[Zeus]

I got it using the formula, P=I2R. 0.75x0.75x 8.=4.5 W.