Physics: Post your doubts here!

[TheDealer]

http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_w09_qp_11.pdf
Help on Q5 please.

 

[rz123]

http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_w09_qp_11.pdf
Help on Q5 please.

just simply calculate the initial velocity at yellow signal. see what quantities u got here. s = 1000m , decc= .2ms^-2, v will be 0 as the train stops at red singnal so we can apply this formula:-
v^2- u^2 = 2as.
u^2= 2 into .2 into 1000 it comes 400 take under root, u will get 20 m/s . i.e the safe speed to drive ur train

 

[TheDealer]

:OOOOOO Damn that should've been easy. -_-
Thanks man!

 

[TheDealer]

What about Q13 of the same paper?

 

[rz123]

What about Q13 of the same paper?

to calculate the tension: use the torque given for wheel q => T = F into s so 3 = F into radius of Q wheel .05. tension in the BELT is 60 N,
same force will be transmitted to the next pulley : so 60 into the radius of p pulley will give u the torque (radius is the perpendicular distance from the line of action of the force). divide this radius by 1000 to get in meters. it comes 4.5 Nm. option D.

 

[leadingguy]

Thank you.

U welcome

 

[leadingguy]

ok so if we solve it like that and get negative sign answer but ignore it ,our marks won't get deducted.and thank you to both of you.

welcome

 

[TheDealer]

http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_w05_qp_1.pdf
Q16 pleasseee!!!!

 

[TheDealer]

Is it that hard?

 

[rz123]

Is it that hard?

did u really try?
work done = force into s , force component along the slope needs to be calculated. the angle which weight makes with the normal reaction line is 30 degree, equal to the angle given ORIGINALLY in the diagram. the weight component we require in these kind of questions is like this , 1 into 10^3 N into sin 30 degree. multiply with the distance given 5 cos 30 degree. we need to use horizontal distance i.e along the slope so dats why its 5 cos 30, multiply these two quantities it will come close to B..

 

[USMAN Sheikh]

salam hurriely need help phy 9702_w10_qp_22 kindly answer my question no 4(b)

and

9702_w10_qp_21 6(b) pls be quick need help before mocks!!!

 

[unique840]

salam hurriely need help phy 9702_w10_qp_22 kindly answer my question no 4(b)

and

9702_w10_qp_21 6(b) pls be quick need help before mocks!!!

first find out the resistance of 1 resistor. (230^2) / 1000 = 52.9 ohms

i) in parallel, the total resistance is 1/R = 1/52.9 + 1/52.9 = 26.45 ohms
power lost = V^2 / R
= (230^2) / 26.45 ohms
= 2000 W
= 2kW

ii) in series, the total resistance is R1 + R2 = 52.9 + 52.9 = 105.8 ohms
power = (230^2) / 105.8 = 5oo W
= 0.5 kW

iii) 1 in series and 2 in parallel so total resistance will be 26.45 + 52.9 = 79.35 ohms
power = (230^2) / 79.35 = 666.67 W
= 0.667 kW

 

[rz123]

salam hurriely need help phy 9702_w10_qp_22 kindly answer my question no 4(b)

and

9702_w10_qp_21 6(b) pls be quick need help before mocks!!!

q.4 b) qp 22 a) draw tangnt frm origin. stop height where tangent get separtd frm curve. the region below shows us Es.
b) area from the point where u left the tagent till .9mm will give u the answer close to 6. 1/2 into .34 into 38

c) dre is a change in the arrangement of atoms and molecules have changed their shape.

 

[rz123]

worksheet 6, question number 1. how its D? or more specifically can u tell me the different situations when different or same masses are approaching towards each other? any link

 

[fawaid]

can someone help me with this question

 

[princesszahra]

worksheet 6, question number 1. how its D? or more specifically can u tell me the different situations when different or same masses are approaching towards each other? any link

i'll answer ur question, check ur physics notes for other cases!

 

[rz123]

i'll answer ur question, check ur physics notes for other cases!

mujhe paki pakai kheer chaiye thi yahan. i forgot those cases in the notes..thanku

 

[princesszahra]

correct ans is
6kms-1 <6mhr-1 <6cms-1 < 6ms-1

 

[princesszahra]

mujhe paki pakai kheer chaiye thi yahan. i forgot those cases in the notes..thanku

hehe np!!!!!!!!!!!!!!!!!

 

[princesszahra]

ill upload the calculation if u want! tell me! @rvel