Physics, Chemistry and Biology: Post your doubts here!

[princess sofia]

Its 2014 paper

wtf ?? where the hell on the earth dd u get it from ?????

 

[princess sofia]

Guys can u help me with:

One man walks along a 10 meters slope at a height of 3 meters. And another man walks straight forward for 8 meters then climbs a ladder at a height of 3 meters.
Which man does more work and why?

look 4 the time being given ,

 

[Zsiddiqui]

May/june 2012 . P 32 . q 11 (b)
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s12_qp_32.pdf

with stepss plss... thank you

 

[princess sofia]

May/june 2012 . P 32 . q 11 (b)
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s12_qp_32.pdf

with stepss plss... thank you

the total we r gvn is 52 , first divide it by 2 = 26
go on the graph nw n look for 26 on y axis , n thn go to the mark at x axis , dats the half life

 

[R_Ma7mooD]

look 4 the time being given ,

No values were given except the distances (Thats what I remember), I had this question on a past paper but I dont seem to find it.

 

[princess sofia]

No values were given except the distances (Thats what I remember), I had this question on a past paper but I dont seem to find it.

i remember thx question , in the options tiime was gvn
the ans is c , where least time 5 is gvn

 

[R_Ma7mooD]

i remember thx question , in the options tiime was gvn
the ans is c , where least time 5 is gvn

Yeah now I remember!, I answered the one climbing but it was wrong, then why its the guy walking on the slope that does more work?

 

[princess sofia]

Yeah now I remember!, I answered the one climbing but it was wrong, then why its the guy walking on the slope that does more work?

the question was abt develping more power , n if more time taken so more power develped

 

[R_Ma7mooD]

the question was abt develping more power , n if more time taken so more power develped

wait, isn't it P= W/t , so less time= more power since Power and time are inversely proportional, right?
I'm kinda lost right now

 

[princess sofia]

wait, isn't it P= W/t , so less time= more power since Power and time are inversely proportional, right?
I'm kinda lost right now

me too , especially in thx topic n resistence one

 

[rida.12.!!]

guys part b plz

 

[rida.12.!!]

A transmission cable of resistance R carries a current I. Write down a formula that gives
the power loss in the cable in terms of R and I.
................................................................................................................................... [1]

 

[rida.12.!!]

is it
I^2R

 

[princess sofia]

is it
I^2R

yp

 

[rida.12.!!]

yp

what about this question

part b

 

[R_Ma7mooD]

guys part b plz
View attachment 43007

The LDR's resistance becomes high, making the voltage across the LDR bigger, which causes the transistor to switch on the lamp.

 

[rida.12.!!]

part b

 

[rida.12.!!]

The LDR's resistance becomes high, making the voltage across the LDR bigger, which causes the transistor to switch on the lamp.

thx

 

[princess sofia]

The LDR's resistance becomes high, making the voltage across the LDR bigger, which causes the transistor to switch on the lamp.

bt voltage is directly propotional to resisitence across a conductor
#CONFUSED

 

[rida.12.!!]

state what is meant by an electromotive force of 12 V