OCR B (Advancing Physics) G492, 25th May 2012 Afternoon

I got 2.8 for x and 4.8 for y. But thinking about it maybe 4.8 shoulda been minus cos it moved down?:/ crap haha


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...Single most hideous experience of my life. That paper made me cry.

Considering I got full UMS in January's paper... yeah... I can't even estimate how badly I might've done this time. I mean, in the end I did answer every question but I really don't think I did very well. That was so much harder than any of the past papers I've looked at. I might retake, unless the grade boundaries are extraordinarily low because I really need close to full UMS...

Anyway, that was hideous, in my opinion. Please say other people thought so too... :\

t was the acceleration, the x component was decelerating and the y component was accelerating, or maybe it should have been negative, i dunno

this is what I can remember:

1a) width of arm = 0.1
b) mass of human = 100

2a) Units question
b)
c)kg ms-2

3a) y=kx
b)y=kx2
c) y=k (square root)x

4
5
6
7
8
9
10
11
12 Ammeters
a) Resolution Definition: The smallest change in measurement which will cause a change in reading on the measuring instrument
b)Digital Ammeter Resolution: 0.01A
Analogue Ammeter Resolution: 1A
c) zero error will cause all the values to be too low
d) move the needle so that it is exactly on 0
e) An ammeter has to have a low resistance when there is a large current because otherwise a lot of power will be dissipated as heat
13 Calculating Planck's constant:
14 Cavendish and the measurement of the earth's density
a)To make the wire stiffer it may have been thicker


I will edit this post when i remember more...

t was the acceleration, the x component was decelerating and the y component was accelerating, or maybe it should have been negative, i dunno

Both should have been negative (accelerated left, and down).

I think I got -1.8 (x) and -4.8 (y).

I didn't like that exam, too much theory stuff, very little mechanics, it was awful. I couldn't do the G.P.E, force question, where it said to consider G.P.E and work out work done, i did it the wrong way.

12 Ammeters
a) Resolution Definition: The smallest change in measurement which will cause a change in reading on the measuring instrument
b)Digital Ammeter Resolution: 0.01A
Analogue Ammeter Resolution: 1A

2 and 1 for the resolution and the analogue are both acceptable answers

this is what I can remember:

1a) width of arm = 0.1
b) mass of human = 100

2a) Units question
b)
c)kg ms-2

3a) y=kx
b)y=kx2
c) y=k (square root)x

4
5
6
7
8
9
10
11 pushing piles into the ground
a) mgh = 2100 * 9.8 * 1.2 = 2.4696 kJ
b) i cldnt work this one out!!!
c) average force = 40/0.85 = 47N
d)effect of mass on the force on the pile... i cant remember what i put but i think i got it wrong
12 Ammetersa) Resolution Definition: The smallest change in measurement which will cause a change in reading on the measuring instrument
b)Digital Ammeter Resolution: 0.01A
Analogue Ammeter Resolution: 1A
c) zero error will cause all the values to be too low
d) move the needle so that it is exactly on 0
e) An ammeter has to have a low resistance when there is a large current because otherwise a lot of power will be dissipated as heat
13 Calculating Planck's constant:
14 Cavendish and the measurement of the earth's density
a)To make the wire stiffer it may have been thicker


I will edit this post when i remember more...

I thought that was a really nice paper. Section A and C were very simple, and section B wasn't too bad.

Definitely much much better than some of the past papers.

I remember the one about the car on the roundabout I got 2.8 and 4.8, but I completely guessed how to do it!! I hated section C


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