OCR Gateway Physics P4P5P6 - 18/06/13

Original post by DeadUnicorn

i think they just hypnotised me to focus now wow :eek:

They had the same effect on me as well :wink:

Reply 301

Original post by andersson

I agree, Carl Sagan, Neil deGrasse Tyson, Bill Nye and Brian Cox are/were brilliant at that :adore:

There's also Lawrence Krauss and Michio Kaku :biggrin:

If you haven't seen this, then I recommend you watch it when you have time (it features Bill Nye, Neil deGrasse Tyson, Richard Dawkins, Brian Greene and Lawrence Krauss and believe me, it is very entertaining to watch Neil deGrass Tyson in this :biggrin:

) :

http://www.youtube.com/watch?v=40YIIaF1qiw

Reply 302

Original post by BP_Tranquility

There's also Lawrence Krauss and Michio Kaku :biggrin:

If you haven't seen this, then I recommend you watch it when you have time (it features Bill Nye, Neil deGrasse Tyson, Richard Dawkins, Brian Greene and Lawrence Krauss and believe me, it is very entertaining to watch Neil deGrass Tyson in this :biggrin:

) :

http://www.youtube.com/watch?v=40YIIaF1qiw

I've never heard of Lawrence Krauss but I love Michio Kaku - I have his book! We can't forget Stephen Hawking or Jim Al-Khalili either...

I'll treat myself to watch that after exams :cool:

Reply 303

Original post by andersson

I've never heard of Lawrence Krauss but I love Michio Kaku - I have his book! We can't forget Stephen Hawking or Jim Al-Khalili either...

I'll treat myself to watch that after exams :cool:

Oh and there's Richard Feynman as well :tongue:

Lawrence Krauss is like Neil deGrasse Tyson in many ways, but still different in his approach (clip)...This is a clip from the video I gave you before ) [video="youtube;WrxJ49xGaJQ"]http://www.youtube.com/watch?v=WrxJ49xGaJQ[/video]

Yeah, okay, I'll let you get back to revising (1 day and a half! :rolleyes:

)

Reply 304

Original post by BP_Tranquility

Oh and there's Richard Feynman as well :tongue:

Lawrence Krauss is like Neil deGrasse Tyson in many ways, but still different in his approach (clip)...This is a clip from the video I gave you before ) [video="youtube;WrxJ49xGaJQ"]http://www.youtube.com/watch?v=WrxJ49xGaJQ[/video]

Yeah, okay, I'll let you get back to revising (1 day and a half! :rolleyes:

)

Oh man, so many distractions! :cry2:

I have to resist the temptation to watch them until after exams... Thanks though, cya :biggrin:

Reply 305

Just thought of a smart 6 marker for P5: explaining why colliding particles cause pressure using equations (e.g. F=m*v, change in M = m*change in V and force = change in M/time) where you would talk about how gas particles have velocity and mass then use those equations to explain how they exert a force on the walls of a container.

Reply 306

To calculate the output voltage in a potential divider circuit, is the equation Vout=(R2)/(R1+R2) x Vin or is it (R1)/(R1+R2) x Vin ?

Thanks :smile:

Reply 307

Original post by BP_Tranquility

To calculate the output voltage in a potential divider circuit, is the equation Vout=(R2)/(R1+R2) x Vin or is it (R1)/(R1+R2) x Vin ?

Thanks :smile:

The former. So the bigger R2's resistance, the lower the reduction of voltage is :redface:

Reply 308

Original post by andersson

The former. So the bigger R2's resistance, the lower the reduction of voltage is :redface:

I see, thanks :smile:

The specification doesn't even have the formula on it so I guess we have to remember it :redface:

Reply 309

Original post by andersson

x

Does your revision guide have any information on this (mine isn't too clear on it)? It's in the Sharing topic for P6. :smile:

ImageUploadedByStudent Room1371396718.974134.jpg

Reply 310

Knowing

1

Could someone please explain potential dividers to me please? I don't get how we're supposed to know whether V(out) is after R1 or after R2. In the questions in my book, sometimes it asks for the voltage out of R1, and sometimes it asks for the voltage out of R2 - how would I know which to work out?

Reply 311

Mutleybm1996

19

Original post by BP_Tranquility

Does your revision guide have any information on this (mine isn't too clear on it)? It's in the Sharing topic for P6. :smile:

ImageUploadedByStudent Room1371397326.424464.jpg

Reply 312

Mutleybm1996

19

Original post by Knowing

Could someone please explain potential dividers to me please? I don't get how we're supposed to know whether V(out) is after R1 or after R2. In the questions in my book, sometimes it asks for the voltage out of R1, and sometimes it asks for the voltage out of R2 - how would I know which to work out?

I believe it's the same? Just use the equation :smile:

Reply 313

Original post by BP_Tranquility

Does your revision guide have any information on this (mine isn't too clear on it)? It's in the Sharing topic for P6. :smile:

What don't you get? Transistors, LEDs or what?

Reply 314

Original post by andersson

What don't you get? Transistors, LEDs or what?

How a transistor can be used to switch on an LED and how you can explain this using a diagram (like the one shown in the image)

Edit: just realised it's actually in the It's Logical section :colondollar:

(edited 10 years ago)

Reply 315

Original post by Knowing

Could someone please explain potential dividers to me please? I don't get how we're supposed to know whether V(out) is after R1 or after R2. In the questions in my book, sometimes it asks for the voltage out of R1, and sometimes it asks for the voltage out of R2 - how would I know which to work out?

I don't know if this will help but this is my description on my P6 mindmap:

http://gyazo.com/febb4cc3dd4cea0fc4d9e05d5808da75

Reply 316

Mutleybm1996

19

Do you guys print out the whole spec? A4 size?

Posted from TSR Mobile

Reply 317

Original post by benwalters1996

Do you guys print out the whole spec? A4 size?

Posted from TSR Mobile

No, I set the printer so it printed 4 pages from the spec onto one A4 page :smile:

Reply 318

Original post by BP_Tranquility

How a transistor can be used to switch on an LED and how you can explain this using a diagram (like the one shown in the image)

Posted from TSR Mobile

A transistor is a tiny electrical switch - so think of it like a light switch but it's turned on or off depending on whether an electric current is supplied to the 'base' or not. When an electric current is supplied to the 'base', the transistor 'closes' (like a light switch closing and completing the circuit, turning on the light) and allows a larger current to flow through the 'collector' and the 'emitter'. In this case the transistor is supplied with a small current (due to the resistor in series with it) which allows the current to flow through the LED because it has 'closed'.

If that didn't help then maybe my description of it on my mindmap will:

http://gyazo.com/cd32ec1db00f02b7d4dc79e48afc06c9

Reply 319

Original post by benwalters1996

Thank you! :biggrin: