unit 3 phy help(6ph07)

[alex]

btw guys what's the gradient of a length against force graph
length--y axis
force--x axis

1/spring constant if i'm not mistaken

 

[jtbteddy]

what is a vernier scale? and what is it used for? give me examples please

 

[Missyyy]

which unit 3 paper? i haven't ever seen it come up

But i wasnt an experiment question. Im hoping to get a detailed one on that.. care to share anyone?

 

[Missyyy]

btw guys what's the gradient of a length against force graph
length--y axis
force--x axis

by length you mean extension* ?
Its 1/k

 

[jtbteddy]

i'm trying so hard to studyyy, but i'm sleepy waht should i dooo

 

[JustAnotherPerson22]

what is a vernier scale? and what is it used for? give me examples please

vernier scale is used to measure the extension
usually used to get the extension in young modulus experiments

 

[Missyyy]

i'm trying so hard to studyyy, but i'm sleepy waht should i dooo

COFFEE helps! or strong tea orrrrr... taking a power nap for an hour or 2 and then getting back to studying fresh

 

[JustAnotherPerson22]

vernier scale is for extension
micrometer screw gauge is for diameter measurements

 

[Missyyy]

vernier scale is for extension
micrometer screw gauge is for diameter measurements

my bad. thank you!

 

[jtbteddy]

In January 2011 Past Paper of Unit 3b, why is the diameter the main source of uncertainty/error in question 7g?

 

[alex]

by length you mean extension* ?
Its 1/k

i think he really means the length of the wire, not the extension.
not that it'd make any difference as the length against force is the same as extension against force, but translated a couple of units up. the gradient won't change.

 

[Missyyy]

i think he really means the length of the wire, not the extension.
not that it'd make any difference as the length against force is the same as extension against force, but translated a couple of units up. the gradient won't change.

Okayy

 

[jtbteddy]

And in the January 2010 paper of Unit 3b, the answer to 5c is: "Metre rule/tape(1)
• Longer length so measurement to nearest mm appropriate (1)
• [allow to nearest ½ mm]"
How do we know the wire is long? Maybe it's just a short one being used?
And why do long lengths have to be measured to the nearest 0.50mm?
And if long lengths have to be measured to the nearest 0.50mm, what do shorter lengths have to be measured to the nearest?

 

[Missyyy]

i think he really means the length of the wire, not the extension.
not that it'd make any difference as the length against force is the same as extension against force, but translated a couple of units up. the gradient won't change.

What is the gradient in the equation v^2 = u^2 + 2as ?

 

[jtbteddy]

Polarisation experiment:
Experiment
[Marks may be earned on diagram or in text]
Named light source plus polaroid (OR polariser OR
polarising filter) / Laser / Named light source and
suitable reflector (e.g. bench) (1)
2nd Polaroid plus means to detect the transmitted light (1)
(i.e. eye OR screen OR LDR OR light detector OR
instruction to e.g. look through polaroids)
Rotate one Polaroid [Only award if expt would work] (1)
Detected intensity varies / No light when polaroids are at 90° (1)
Maxima and minima 90° apart / changes from dark to light every 90° (1)
[Use of microwaves, slits or “blockers”: 0/5
Use of filters or diffraction gratings: lose first two marks
Use of “sunglasses” to observe: lose mark 2]

 

[alex]

What is the gradient in the equation v^2 = u^2 + 2as ?

totally depends on the graph you intend to plot

 

[Missyyy]

Is the edexcel site down again?
What the usual score for an A in 6PH07 btw?

 

[alex]

Is the edexcel site down again?
What the usual score for an A in 6PH07 btw?

around 30, a 32 would definitely be an A.

 

[jtbteddy]

why doesn't anyone ever answer my questions? i always reply to everyone else's, but everyone ignores me, that's great

 

[jackoo123]

What exp. came in the exam?? Pls help