Physics: Post your doubts here!

[hela]

q22 plaese thank you alot

 

[GorgeousEyes]

Does anybody have videos for electricity ? I can't understand it :/

 

[hela]

q 22 and 35 please

 

[hela]

help solve q 22 and q 35 and q12

 

[hela]

plaese these questions

 

[hela]

plaese this question 2
thanks
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w07_qp_2.pdf

 

[hela]

plaese q number 2
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w07_qp_2.pdf

 

[hela]

plaese question number 2
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w07_qp_2.pdf

 

[hela]

please q 2 of this paper
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w07_qp_2.pdf

 

[hela]

q 2 please
http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w07_qp_2.pdf

 

[snowbrood]

q 2 please
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_2.pdf

for q 12
the distance of block from the level of head of the man is 18m and when to level the head with the block man travels 9m upwards and block 9m downwards.
tension acts towards the pulley and the weight acts opposite to tension i.e downwards.
force acting in the direction of acceleration is considered more in magnitude than the force in opposite direction

for the man
T-80g=80a equation 1
120g-T=120a equation2
adding both equations we get
40g=200a
a=0.2g (given g as 10ms^-2)
a=2ms^-2
v^2=2as (as initial velocity of both the objects is zero )
v^2=2*2*9
v^2=36
v=6ms^-1

 

[hela]

plaese question 5 c

http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w09_qp_21.pdf

 

[hela]

please q 2 of this paper

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_2.pdf

 

[hela]

for q 12
the distance of block from the level of head of the man is 18m and when to level the head with the block man travels 9m upwards and block 9m downwards.
tension acts towards the pulley and the weight acts opposite to tension i.e downwards.
force acting in the direction of acceleration is considered more in magnitude than the force in opposite direction

for the man
T-80g=80a equation 1
120g-T=120a equation2
adding both equations we get
40g=200a
a=0.2g (given g as 10ms^-2)
a=2ms^-2
v^2=2as (as initial velocity of both the objects is zero )
v^2=2*2*9
v^2=36
v=6ms^-1

plaese question 2 of this paper
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_2.pdf

 

[hela]

question 5 c of this paper
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w09_qp_21.pdf

 

[snowbrood]

emf means electricity generated from different forms of energy it depends upon the source in this case it is chemical energy chemical energy wont change unless u reduce the chemical energy emf wont change..
potential difference means electricity converted into different forms of energy primarily heat... As electrons pass through the cell energy is transferred to them from the chemical energy stored in the cell. This process and the chemicals themselves provide resistance and this is known as internal resistance.
potiential difference across a cell wont change because of some fixed resistor visualize cell as a water pump resistor as the cross sectional area of pipe
increasing or decreasing resistance would not affect the water that goes out and in the pump ....

 

[hela]

emf means electricity generated from different forms of energy it depends upon the source in this case it is chemical energy chemical energy wont change unless u reduce the chemical energy emf wont change..
potential difference means electricity converted into different forms of energy primarily heat... As electrons pass through the cell energy is transferred to them from the chemical energy stored in the cell. This process and the chemicals themselves provide resistance and this is known as internal resistance.
potiential difference across a cell wont change because of some fixed resistor visualize cell as a water pump resistor as the cross sectional area of pipe
increasing or decreasing resistance would not affect the water that goes out and in the pump ....

you have answered q6
i need q5
thanks
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w09_qp_21.pdf

 

[snowbrood]

plaese question 2 of this paper
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_2.pdf

for question 2
E=V/d
E=220/1.5*10^-2=1.4*10^4
f=ma
f=VQ/d
E=V/d
therefore
f=EQ
f=ma
ma=EQ
a=EQ/m
a=(1.4*10^4)*1.6*10^-19/(9.1*10^-31)
charge of electron and mass of electron is written in book we should know these both
a=2.5*10^15

part c(ii)
v=d/t
t=d/v
t=0.12/5*10^7
t=2.4*10^-9

 

[hela]

for question 2
E=V/d
E=220/1.5*10^-2=1.4*10^4
f=ma
f=VQ/d
E=V/d
therefore
f=EQ
f=ma
ma=EQ
a=EQ/m
a=(1.4*10^4)*1.6*10^-19/(9.1*10^-31)
charge of electron and mass of electron is written in book we should know these both
a=2.5*10^15

part c(ii)
v=d/t
t=d/v
t=0.12/5*10^7
t=2.4*10^-9

i need this question plaese 5 c
http://papers.xtremepapers.com/CIE/...nd AS Level/Physics (9702)/9702_w09_qp_21.pdf

 

[hela]

please answer this question