OCR Gateway Physics P4P5P6 - 18/06/13

I attached some practice six markers back here if anyone's interested :biggrin:

Original post by BP_Tranquility

I've attached some six markers. :smile:

The P5 one looks to be the most difficult out of the three!

P4- ImageUploadedByStudent Room1371483427.244815.jpg

P5-

ImageUploadedByStudent Room1371483441.003551.jpg

P6-

ImageUploadedByStudent Room1371483450.592612.jpg

Reply 483

ryanb97

15

Original post by Knowing

Because he got it wrong (no offence :smile:

)

1/3 + 1/4 + 1/5 = 0.783... (he put 1/0.783, which is wrong)
And then you find the inverse of 0.738, giving you 1/0.783 = 1.28

Original post by BP_Tranquility

Because we have 1/total resistance when we add up the other fractions so we have to find the inverse by raising it to the power of -1 , to get total resistance/1 which is the value we want...It's the same as finding the reciprocal :cool:

oh yeah..i remember know .....

i did the Physics spec paper

Spoiler

Reply 484

Elcor

14

Does a motor create AC or DC?

Reply 485

ryanb97

15

Original post by 'THE MASTER'

So then who's the smartest here?

In what ... L'evil Fishzzzz words...

Ryan

Reply 486

Original post by andersson

Does a motor create AC or DC?

A motor uses DC- this is why it needs a commutator to switch the direction of the current every half turn and allow it to continue spinning :cool:

Reply 487

L'Evil Fish

OP

18

Original post by BP_Tranquility

I attached some practice six markers back here if anyone's interested :biggrin:

Answers?

Reply 488

Original post by andersson

Does a motor create AC or DC?

A motor creates kinetic energy :wink:

Reply 489

Elcor

14

Original post by BP_Tranquility

A motor uses DC- this is why it needs a commutator to switch the direction of the current every half turn and allow it to continue spinning :cool:

Yeah thanks I got it now, CGP only says that in an indirect way :lol:

Reply 490

Elcor

14

Original post by Knowing

A motor creates kinetic energy :wink:

Shh ant

Reply 491

Daniel97g

4

In optics, why are real images inverted?
How do Diode depletion layers work?
What is meant by a 'smooth' voltage output?

Reply 492

Original post by Knowing

A motor creates kinetic energy :wink:

Energy can't be created or destroyed :tongue:

Reply 493

Original post by BP_Tranquility

Energy can't be created or destroyed :tongue:

Dang it! You know what I mean :lol:

transfers electrical energy into kinetic :tongue:

Reply 494

Original post by L'Evil Fish

Answers?

Answers attached :smile:

-P4-

ImageUploadedByStudent Room1371499487.634212.jpg

-P5-

ImageUploadedByStudent Room1371499501.194392.jpg

ImageUploadedByStudent Room1371499514.060868.jpg

-P6-

ImageUploadedByStudent Room1371499559.537592.jpg

Reply 495

ryanb97

15

Ok so o need to go ober diodes and rectification....although I dnt think it will cone up ... Maybe a 2/3 mark question

Posted from TSR Mobile

Reply 496

Red Fox

11

Original post by ryanb97

Ok so o need to go ober diodes and rectification....although I dntthibk ot will cone up ... Maybe a 2/3 mark question

Posted from TSR Mobile

I don't even understand it :frown:

. Also, are you drunk? :lol:

(edited 10 years ago)

Reply 497

Original post by BP_Tranquility

Answers attached :smile:

-P4-

-P5-

-P6-

The answers to P5 don't correspond to the question :s-smilie:

Reply 498

Original post by Knowing

The answers to P5 don't correspond to the question :s-smilie:

They do

-Polarisation can only happen when light acts as a wave
-When you have two slits, then this evidences that light acts as a wave (an interference pattern can only caused by a wave)
-Therefore, you can only find the path difference using the wavelength when light acts as a wave (you find the path difference to see if there is constructive and destructive interference).
-When light acts as a wave, then it slows down in a prism. If it acted like a particle, this effect wouldn't happen.

Hopefully, they won't ask a question like that in the exam :redface:

Reply 499