• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Physics: Post your doubts here!

Messages
355
Reaction score
95
Points
38
q22 plaese thank you alot
 

Attachments

  • question xtremepapers.doc
    181.5 KB · Views: 1
Messages
355
Reaction score
95
Points
38
help solve q 22 and q 35 and q12
 

Attachments

  • question xtremepapers.doc
    522.5 KB · Views: 0
Messages
887
Reaction score
466
Points
73
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
 
Messages
355
Reaction score
95
Points
38
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
 
Messages
887
Reaction score
466
Points
73
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 ....
 
Messages
355
Reaction score
95
Points
38
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
 
Messages
887
Reaction score
466
Points
73
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
 
Messages
355
Reaction score
95
Points
38

Attachments

  • question xtremepapers.doc
    149 KB · Views: 1
Messages
355
Reaction score
95
Points
38
please answer this question
 

Attachments

  • question xtremepapers.doc
    298 KB · Views: 6
Top