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# OCR Gateway Physics P4P5P6 - 18/06/13 watch

1. (Original post by benwalters1996)
Attachment 227553 any ideas?

No mark scheme

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It curves because as soon as the football is kicked, the only force acting upon the ball is gravity (apart from air resistance). Because of this, it has a parabolic path. After being kicked, its horizontal velocity does not increase further, but its vertical velocity increases due to the gravitational pull of the Earth, so the ball is pulled down towards the ground, making it curved.

I'm not sure what else you could say for that - seems like 6 marks is too much for that question..
2. Quick question: is the motor effect direct current and a generator alternating current?
3. (Original post by Turtlefushsia)
Quick question: is the motor effect direct current and a generator alternating current?
Yeah it is, I'm just revising that now.
4. (Original post by BP_Tranquility)
Well, these are some things I would include:
-parabolic trajectory
-horizontal velocity constant
-vertical velocity changes (due to gravity)
-Newton's prediction on what would happen if the ball was kicked hard enough
-same principle that keeps satellites in orbit
-the critical angle would be 45 degrees if he wanted to kick it as far as possible

Is that from the specimen by the way?
yes
5. Please can someone explain to me how capacitors are used in smoothing???
6. (Original post by benwalters1996)
yes
Hey...I have the exam tomorow as well...
I am a bit confused about certain questions...can someone help me please?
I haven't even tarted P6 revision because I am stuck with P5.. :/

The question says:

A helicopter is 40m above an injured walker. It drops supplies by parachute, which falls at 4 m/s. Thw wind is blowin with a horizontal velocity of 10mm/s.

How far horizontally must the helicopter be from the walker when it drops the parachute?

I was thinking that because thi is involving both horizontal and vertial velocity, it might need the parallelogram vector thing where we use pythagos theorum but I am not sure..can someone please helpme? Thank you
7. Can someone explain the isolating transformer please? CGP revision guide is a little vague :/

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8. Oh my I am hating Logic Gates and P6 overall. How many marks do you guys think a truth table question will be?
9. Hey...I have the exam tomorow as well...
I am a bit confused about certain questions...can someone help me please?
I haven't even tarted P6 revision because I am stuck with P5.. :/

The question says:

A helicopter is 40m above an injured walker. It drops supplies by parachute, which falls at 4 m/s. Thw wind is blowin with a horizontal velocity of 10mm/s.

How far horizontally must the helicopter be from the walker when it drops the parachute?

I was thinking that because thi is involving both horizontal and vertial velocity, it might need the parallelogram vector thing where we use pythagos theorum but I am not sure..can someone please helpme? Thank you
10. (Original post by bossun)
Oh my I am hating Logic Gates and P6 overall. How many marks do you guys think a truth table question will be?
2/3

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11. (Original post by 123..help me)
Hey...I have the exam tomorow as well...
I am a bit confused about certain questions...can someone help me please?
I haven't even tarted P6 revision because I am stuck with P5.. :/

The question says:

A helicopter is 40m above an injured walker. It drops supplies by parachute, which falls at 4 m/s. Thw wind is blowin with a horizontal velocity of 10mm/s.

How far horizontally must the helicopter be from the walker when it drops the parachute?

I was thinking that because thi is involving both horizontal and vertial velocity, it might need the parallelogram vector thing where we use pythagos theorum but I am not sure..can someone please helpme? Thank you
Can you show the actual question on the page?

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12. (Original post by Turtlefushsia)
Please can someone explain to me how capacitors are used in smoothing???
In a circuit, there's a current and half wave rectification happens when there's a diode. A capacitor smooths out the output; when the circuit is switched on, the capacitor begins to store charge when the voltage in the circuit is high enough. The capacitor stores charge that is equal to the amount of voltage in the circuit. Every half cycle, the voltage falls and when it falls to a certain level, the capacitor discharges the stored charge so the voltage increases back up again. The capacitor then stores more charge. After another half cycle, the voltage falls again, and when it falls to a certain level, the capacitor discharges, increasing the voltage. This process repeats and it 'smooths' the output since the voltage doesn't fall too loo much.

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13. (Original post by benwalters1996)
Can you show the actual question on the page?

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sorry...camera on my mobile won't work..there's a problem with it..
This wasn't a question from a past paper..it's on one of those workheets from my teacher...
14. (Original post by IHTWFR)
Let me tell you the things that ****ed me over in the workbook:

Polarization, Momentum and Interference of waves
You owe me
Attached Images

15. (Original post by benwalters1996)
Can someone explain the isolating transformer please? CGP revision guide is a little vague :/

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Isolating transformers have the same number of turns in the coil on both the primary and secondary transformers. However, this does not affect the voltage (unlike step up/step down transformers) and both parts are isolated from each other- i.e. they're not connected to each other and separate.

This is often used in shaving sockets because the two parts in the circuit aren't connected which reduces the risk of becoming electrocuted. This is because the isolation of the two parts reduces the chance of contact between the live parts (e.g. mains wire) and the earth lead (e.g. The shaver who is earthed and could have electricity flow through them if an isolating transformer wasn't used). This in turn reduces the risk of electrocution.

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16. (Original post by BP_Tranquility)
In a circuit, there's a current and half wave rectification happens when there's a diode. A capacitor smooths out the output; when the circuit is switched on, the capacitor begins to store charge when the voltage in the circuit is high enough. The capacitor stores charge that is equal to the amount of voltage in the circuit. Every half cycle, the voltage falls and when it falls to a certain level, the capacitor discharges the stored charge so the voltage increases back up again. The capacitor then stores more charge. After another half cycle, the voltage falls again, and when it falls to a certain level, the capacitor discharges, increasing the voltage. This process repeats and it 'smooths' the output since the voltage doesn't fall too loo much.

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Thank you so much! I understand now
17. (Original post by IHTWFR)
Let me tell you the things that ****ed me over in the workbook:

Polarization, Momentum and Interference of waves
Where's polarisation?

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18. does anyone have a rough idea of what the grade boundaries will be like, I know its hard to tell but just an estimate??
19. (Original post by IHTWFR)
Let me tell you the things that ****ed me over in the workbook:

Polarization, Momentum and Interference of waves
Not even a thank you! You know a little politeness goes a long way these days
Not even a thank you! You know a little politeness goes a long way these days
I know how you feel!

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