How did u guyz do in phys p1 ?

[MAF]

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

yes i can if someone can remind me of the values

lol, you're one overconfident guy...
and lol, for efficiency its energy required/work done.
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]

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

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.

[mr.incredible]

I need to check two other questions.

1. The one of the minimum resultant force of three forces.
2. That one of the stationary or moving charge and parallel or perpendicular electric field lines

[Joseph_COOL]

How about the question where it says which graph is representing the force acting on an electron as distance x increases (x was the distance from negative to positive plate)??
my answer was A (the parabola)
anyone knows the right answer plz reply

[A.T]

How about the question where it says which graph is representing the force acting on an electron as distance x increases (x was the distance from negative to positive plate)??
my answer was A (the parabola)
anyone knows the right answer plz reply

force would be constant straight line parralel to x-axis

I need to check two other questions.

1. The one of the minimum resultant force of three forces.
2. That one of the stationary or moving charge and parallel or perpendicular electric field lines

minimum is 0.
5N left and 3,4 N force on the right acting at 90 degree to each other
R^2=3^2 + 4^2
R=5
5-5 = 0


charge can be stationary or moving and force is parallel to field


Ans i remember:
2.45 reading for screw gauge
neuclear reaction, neutrons conserved
2 masses stick v=10
P*V=energy
Q1 unit of volt ans was D
kirchoff one,conservation ofcharge
efficiency one was D mgsin/F
K=200 spring constant
A=1.3 acceleration
A doubled D double X remains same
5.5kw power
v=w/q e=w/q


and guys does anyone know the answer for the 2 same masses 1 station other collides with velocity V?

[mr.incredible]

force would be constant straight line parralel to x-axis


minimum is 0.
5N left and 3,4 N force on the right acting at 90 degree to each other
R^2=3^2 + 4^2
R=5
5-5 = 0


charge can be stationary or moving and force is parallel to field


Ans i remember:
2.45 reading for screw gauge
neuclear reaction, neutrons conserved
2 masses stick v=10
P*V=energy
Q1 unit of volt ans was D
kirchoff one,conservation ofcharge
efficiency one was D mgsin/F
K=200 spring constant
A=1.3 acceleration
A doubled D double X remains same
5.5kw power
v=w/q e=w/q


and guys does anyone know the answer for the 2 same masses 1 station other collides with velocity V?

Are you sure that the force is parallel to the field ?? I chose stationary or moving charge and force is perpendicular to field.

For the spring constant, i got it 500 N/m.

The one you're asking about is D which was already a past paper question.

What did you chose for the rubber graph question ?

[A.T]

Are you sure that the force is parallel to the field ?? I chose stationary or moving charge and force is perpendicular to field.

For the spring constant, i got it 500 N/m.

The one you're asking about is D which was already a past paper question.

What did you chose for the rubber graph question ?

The force is parallel to the FIELD(pretty sure)
hmm what was D? was it 1/2 v to right and left?
I chose B, gradient of curve decreasing... (dunno if its correct)
and spring constant was 200 man we had to find the gradient of line

[mr.incredible]

The force is parallel to the FIELD(pretty sure)
hmm what was D?
I chose B, gradient of curve decreasing... (dunno ifits correct)
and spring constant was 200 man we had to find the gradient of line...(was ur p11)

Yeah, I think i knew now why the force is parallel to the field. I have just misinterpreted the question.

D was the first ball stops and the second ball moves with v.

Well i tried the spring constant several times and i got it 500 N/m and i did get the gradient. I took the first point and last one on the graph.

What about that power question of the resistor, was it 3 Ohms or 2 Ohms and that question of the density and spacings of water ?

[A.T]

Yeah, I think i knew now why the force is parallel to the field. I have just misinterpreted the question.

D was the first ball stops and the second ball moves with v.

Well i tried the spring constant several times and i got it 500 N/m and i did get the gradient. I took the first point and last one on the graph.

What about that power question of the resistor, was it 3 Ohms or 2 Ohms and that question of the density and spacings of water ?

2 ohm and density and spacing one i dunno:P
and i am pretty sure the ccordinates were (40,12) (100,0) // 40,100 were in mm and gradient is 200.
aw i did the ball one wrong

[sloe]

I got 200N/m by finding the gradient using the coordinates given by A.T.. Im curious, how did u guys get 500n/m? And I dont remember the ques. abt. the power and resistors (the 2 or 3 ohm one). Wasnt there a ques. abt. a 24W battery (we had to find the power dissipated in resistor R iirc. there were 2 other resistors, P&Q). I got 4W for that one.

[XaM!!]

NOOOOOOOOOOOOOOOOOOOO!!!!!!!!!!!!!!!!!!!!

i got atleast 5-6 worong... 

[hesho21]

force would be constant straight line parralel to x-axis


minimum is 0.
5N left and 3,4 N force on the right acting at 90 degree to each other
R^2=3^2 + 4^2
R=5
5-5 = 0


charge can be stationary or moving and force is parallel to field


Ans i remember:
2.45 reading for screw gauge
neuclear reaction, neutrons conserved
2 masses stick v=10
P*V=energy
Q1 unit of volt ans was D
kirchoff one,conservation ofcharge
efficiency one was D mgsin/F
K=200 spring constant
A=1.3 acceleration
A doubled D double X remains same
5.5kw power
v=w/q e=w/q


and guys does anyone know the answer for the 2 same masses 1 station other collides with velocity V?

yeh the first one stops and the other moves to the right at a speed of v thats a repeated question