physics paper 33

[mujtabashahnawaz]

great now can some1 tell me wats d ryt method? eeeeeeeeeeaaaak m confuso amigos

Just use Uncertainity/Original Value * 100...It can never be wrong

 

[samwickz]

hehe u myt think m nuts but hay its kinda creepy 2 look @ ur profile pic with dat gostly looking skull man staring ryt in2 ur face lol specially n d middle of d nyt

 

[Usman Ismail]

hehe u myt think m nuts but hay its kinda creepy 2 look @ ur profile pic with dat gostly looking skull man staring ryt in2 ur face lol

mine??

 

[Casablanca]

hehe u myt think m nuts but hay its kinda creepy 2 look @ ur profile pic with dat gostly looking skull man staring ryt in2 ur face lol

It's the logo from Gears of War.

 

[samwickz]

mine??

ya kinda

 

[Almostdoctor]

thnx a million..rely did hlp alot... n it mst hav been alot to type!!!!

Lol copy past

 

[samwickz]

It's the logo from Gears of War.

jeeeze its still super duper creepy! hmp

 

[Almostdoctor]

isnt this how we calculate uncertainty
0.1/2
=0.05/25 *100
??

Yeah percentage uncertainty = (least count /2)/ measured value * 100

 

[Zain Ashfaq]

somebody on the other thread said that we will have 1st question on force etc and the 2nd one on heating? dude help me plz i have NO idea what kinda heating questions they may give us in PHYSICS??? ive never seen any heating questions in the physics practical... =S im really confused! those who have info on this, plz help me out man ill be really thankfull! give me some details on the heating question that we may have as Question no.2

There can't be a practical on heating. Its not in AS syllabus.

 

[Casablanca]

There can't be a practical on heating. Its not in AS syllabus.

There are past papers with it though. :l

 

[pearlzeye]

practice this set .. the question is like this only

which ques??? Q1 or 2

 

[thunderingthunder]

This one has wires ....that like electricity

Exactly what i was thinking of:S

 

[Dani boi]

Exactly what i was thinking of:S

use the limitations and improvements of this practical only.............
in fact this paper can't come coz its the latest one ............
its limitations and improvements are helpful

 

[Almostdoctor]

hey ..i heard tht from some trusted source..they said yea,no electricity..for question 1,its about spring...set-up : 2 retorts stands where 2 springs will be on both side...i think they will be a string or wire connected between both springs...then,we will add slotted weights...next,calculated the angle of deflection of the wire/string when weights added... for question 2,its about measurement of the rate of cooling of water (or any liquid) ... this is for p33...All the best for tomorrow!!

This is variant 3 right?

 

[Usman Ismail]

Exactly what i was thinking of:S

this is confirmed NO ELECTRICITY !!!!!!!

 

[Usman Ismail]

This is variant 3 right?

yup

 

[Usman Ismail]

use the limitations and improvements of this practical only.............
in fact this paper can't come coz its the latest one ............
its limitations and improvements are helpful

quote some mate

 

[Almostdoctor]

Someone pls help me with question 1 part f
http://www.xtremepapers.com/community/attachments/9702_w11_qp_35-pdf.9549/

 

[Almostdoctor]

quote some mate

(i) Limitations 4 max.

Two readings are not enough (to draw a conclusion)
Heat loss (to surroundings or beaker)

Small value of (θ2 – θ1)/
% uncertainty in (θ2 – θ1) is large

Low precision of thermometer
Resistor/bulb of thermometer is not completely immersed

Water is left behind in measuring cylinder

Resistor continues to give out heat when switched off/ temperature continues to rise after switching off

(ii) Improvements 4 max.

Take more readings and plot a graph/calculate more k values (and compare)
Method to reduce heat loss, e.g. lagging, lid

Method to increase (θ2 – θ1) e.g. higher voltage, lower resistance, increased time, less water

Either: thermometer with specified better precision, e.g. 0.1 oC, 0.5 oC
Or: named device such as thermocouple or resistance thermometer.

Use narrower beaker

Method to measure mass of water, e.g. subtract mass of empty beaker from mass of beaker with water

Wait until temperature reaches a maximum before reading

 

[Dani boi]

(i) Limitations 4 max.

Two readings are not enough (to draw a conclusion)
Heat loss (to surroundings or beaker)

Small value of (θ2 – θ1)/
% uncertainty in (θ2 – θ1) is large

Low precision of thermometer
Resistor/bulb of thermometer is not completely immersed

Water is left behind in measuring cylinder

Resistor continues to give out heat when switched off/ temperature continues to rise after switching off

(ii) Improvements 4 max.

Take more readings and plot a graph/calculate more k values (and compare)
Method to reduce heat loss, e.g. lagging, lid

Method to increase (θ2 – θ1) e.g. higher voltage, lower resistance, increased time, less water

Either: thermometer with specified better precision, e.g. 0.1 oC, 0.5 oC
Or: named device such as thermocouple or resistance thermometer.

Use narrower beaker

Method to measure mass of water, e.g. subtract mass of empty beaker from mass of beaker with water

Wait until temperature reaches a maximum before reading

Copy paste