Physics, Chemistry and Biology: Post your doubts here!

[Awesome12]

Hi guys may anyone give me a guide on how to complete this. Please anyone or any easy way to complete these.

echo involves sound going from you, reflecing off a surface, and then coming back to you (ie. 2*distance)

speed = 2*distance/time

330=2*d/0.40

d=66m

 

[Usman Abdul Jabbar]

echo involves sound going from you, reflecing off a surface, and then coming back to you (ie. 2*distance)

speed = 2*distance/time

330=2*d/0.40

d=66m

Thankyou alot . It's not mentioned in my IGCSE PHYICS book.

 

[fantastic girl]

1) How can you measure diametre of cylindrical rod using thread?
2)How can you find resistance of a wire using ohm's law and electrical instruments?
Awesome12
fantastic girl
shazmina
***amd***
Iridescent

1) Roll the thread over the cylindrical rod n measure the length of the thread for one complete roll
or roll it many times....then find the length of the thread and divide the answer by the no. of rolls u made

 

[fantastic girl]

1) How can you measure diametre of cylindrical rod using thread?
2)How can you find resistance of a wire using ohm's law and electrical instruments?
Awesome12
fantastic girl
shazmina
***amd***
Iridescent

2) * Keep the rheostat/variable resistor in the maximum resistant position before closing the switch of the circuit
* Close the switch and move the rheostat to different positions and note the Voltage and current value
* Plot the graph of V in y axis and I in axis
* Find the gradient
* Gradient = Resistance

 

[***amd***]

1) How can you measure diametre of cylindrical rod using thread?
2)How can you find resistance of a wire using ohm's law and electrical instruments?
Awesome12
fantastic girl
shazmina
***amd***
Iridescent

1) wrap the thread around the rod (just 1 rotation). measure that length of thread around around the rod, that is it's circumference. (suppose it is x)
x/pi = its diameter

 

[fantastic girl]

1) wrap the thread around the rod (just 1 rotation). measure that length of thread around around the rod, that is it's circumference. (suppose it is x)
x/pi = its diameter

JazakAllah Khair bro.....just realized that i forgot to mention the diameter part
Umar Ahmed sorry bro...

 

[1357911]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s12_qp_33.pdf
Q9 b? Can anyone please explain?

 

[Awesome12]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s12_qp_33.pdf
Q9 b? Can anyone please explain?

they have said the resistance of each lamp is 8.0 and that it has increased by 15 %
thus the resistance of each lamp is
=8*15/100
=8.4

they have said that that if the current is 0.9 A then the fuse will flow
thus the resistance in the circuit should be
240/0.9
=266.7

if each lamp gives a resistance of 8.4 A, then the required no. of bulbs to equal the resistance is
266.7/8.4
=31.7

40-32
=8 lamps should fail

 

[1357911]

they have said the resistance of each lamp is 8.0 and that it has increased by 15 %
thus the resistance of each lamp is
=8*15/100
=8.4

they have said that that if the current is 0.9 A then the fuse will flow
thus the resistance in the circuit should be
240/0.9
=266.7

if each lamp gives a resistance of 8.4 A, then the required no. of bulbs to equal the resistance is
266.7/8.4
=31.7

40-32
=8 lamps should fail

Jazakallahu Khairan.

 

[Usman Abdul Jabbar]

Hey guys may anyone tell me that are calculators are allowed in CIE IGCSE PHYSICS and CIE IGCSE MATHS Extended

 

[Usman Abdul Jabbar]

Ca

plz post which one r u planning to buy i prefer
http://www.casio.com/products/Calculators_&_Dictionaries/Fraction_&_Scientific/FX-115ESPLUS/

http://www.casio.com/products/Calculators_&_Dictionaries/Fraction_&_Scientific/FX-300ESPLUS/

these two are allowed for all subjects

I'd like to buy the second one

 

[Awesome12]

plz post which one r u planning to buy i prefer
http://www.casio.com/products/Calculators_&_Dictionaries/Fraction_&_Scientific/FX-115ESPLUS/

http://www.casio.com/products/Calculators_&_Dictionaries/Fraction_&_Scientific/FX-300ESPLUS/

these two are allowed for all subjects

there is another one
991 ES PLUS
that is the best one
it has like like 450 functions, and i prefer that
i suggest u have a look at that as well

 

[Usman Abdul Jabbar]

no i only need it only for the exam only

 

[Usman Abdul Jabbar]

no i only need it only for the exam only

i mean like only temporary not extra functions

 

[Awesome12]

i mean like only temporary not extra functions

yeah alright whatever suits u
i was just saying so, so that u cud have a permanent one instead of constantly buying new calculators

 

[Omar alnajjar]

Physics IGCSE QUESTION: DESCRIBE IN TERMS OF ITS ATOM (SPOON) HOW THERMAL ENERGY TRANSFERRED THROUGH A METAL?

 

[asimkhanfar]

can anyone give me some online sources for bio/physics/chem besides the bbc bitesize? I want something with extra details, not just a summary of the chapter.

thanks

 

[Awesome12]

Physics IGCSE QUESTION: DESCRIBE IN TERMS OF ITS ATOM (SPOON) HOW THERMAL ENERGY TRANSFERRED THROUGH A METAL?

heat energy is absorbed by the free electrons and they pass on the heat to each other

 

[kirann]

Describe the processes by which energy is converted from one form to another,including refernce to
(1) chemical/feul energy (a re-grouping of atoms)
(2) hydroelelctric generation ( emphasising the mechanical energies involved)
(3) solar energy (nuclei of atoms in the sun)
(4) nuclear energy
(5) geothermal energy
(6) wid energy
Plz help
Can anybody explain?

 

[shoaib672002]

need answer fast
View attachment 36935

View attachment 36937

I am pretty sure the question says LAMPS and as far as i know lamp has a symbol