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How did u guyz do in phys p1 ?

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MAF:

--- Quote from: Spy on May 20, 2010, 03:52:59 pm ---no im sure its C because effeciency=work/energy input
and we all know work=ke=0.5mv^2 and energy input is worke done by driving force which is equal to Fs

0.5mv^2/Fs = mv^2/2Fs

it had nothing to do with mgsin because its energy and mass not weight
and even if it was constant so? just keep it 0.5mv^2 you still have a velocity
though you have a point ima_shah2002 :P

yes i can if someone can remind me of the values :)

--- End quote ---
lol, you're one overconfident guy...:P
and lol, for efficiency its energy required/work done. :P
work done is always more than the amount of energy required to the thing required, cos work done also includes work done against resistance.....

mr.incredible:
Ok guys, Here is the uncertainty question:

Mass of beaker = 20 +/- 1 gm
Mass of beaker + Mass of liquid = 70+/- 1 gm
Volume of liquid= 10 +/-6 cm^3
The value of the density given was 5 gm/cm^3

To get the maximum density we need to get the maximum mass of liquid over minimum density of liquid.

Maximum mass = 71 - 19= 52 gm
Minimum volume= 9.4 cm^3

Maximum density= 52/9.4 = 5.5319

Uncertainty= 5.5319-5= 0.53191

So the uncertainty should be +/- 0.5

halosh92:

--- Quote from: mr.incredible on May 20, 2010, 06:10:24 pm ---Ok guys, Here is the uncertainty question:

Mass of beaker = 20 +/- 1 gm
Mass of beaker + Mass of liquid = 70+/- 1 gm
Volume of liquid= 10 +/-6 cm^3
The value of the density given was 5 gm/cm^3

To get the maximum density we need to get the maximum mass of liquid over minimum density of liquid.

Maximum mass = 71 - 19= 52 gm
Minimum volume= 9.4 cm^3

Maximum density= 52/9.4 = 5.5319

Uncertainty= 5.5319-5= 0.53191

So the uncertainty should be +/- 0.5

--- End quote ---

this was A right?

Maryum:
is this GCSE?

mr.incredible:
@ Halosh:
I cannot actually remember the letter of 0.5 but as far as i can it was C.

@ Maryum:
No, This Cie GCE AS level Physics.

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