Qualification > Sciences
Physics Help HERE ONLY !!
MaNa:
--- Quote from: Bani on May 23, 2009, 10:50:50 pm ---Is it clear now?
CRT- light
CRO- to make screen glow
--- End quote ---
naahin !!!
kinda
anyways i guess i cnt think anymore
uffh GUYS HELP ME I CANT STUYDY BUT I WANT TOO ANY SUGGESTIOZN
Bani:
--- Quote from: mana on May 23, 2009, 10:57:55 pm ---
--- Quote from: Bani on May 23, 2009, 10:50:50 pm ---Is it clear now?
CRT- light
CRO- to make screen glow
--- End quote ---
naahin !!!
kinda
anyways i guess i cnt think anymore
uffh GUYS HELP ME I CANT STUYDY BUT I WANT TOO ANY SUGGESTIOZN
--- End quote ---
If you remember Total Internal Reflection, you will be able to understand the use of Cathode Ray Tube.(CRT)
and I think you know when CRO is used (to make the screen glow). The question you asked about only asked to draw apparatus to detect the Beta particles. So, in this case, the simple source, absorber, detector apparatus would be drawn.
To concentrate more, just think of the fruitful result you'd get if you study hard. Oh, by the way, its 1:00, so u'd better be able to concentrate in the morning. :)
zubair_slipknot:
I have got a problem in Physcis October/November 2008 Paper3 question 2 (d)...I have no idea that why am i finding it hard
Calculate the force on the pivot when the two masses choosen are hanging from the disc????
F=ma
or F=mg
F=200x9.8
is it like this...i am sure i am wrong somewhere...plz let me know as soon as possible...thx
Hope:
the force on the pivot = force (N) x distance (m)
the pivot, is the circle that is shaded in.. so when you add a force at a specific distance from the pivot, there will be a moment.. Do that to the other side too, and you will also get a moment.
The questions prior to the one you are asking about, wanted no net moment, this means the whole system is in equillibrium..
so for example, if you had a mass of 10N on the right, 3 m away from the pivot..the moment of the force is = 10 x 3 = 30 Nm
and to maintain equillibrium, the other side would have to balance in someway..so it could have 15N at a distance of 2 m from the pivot .. 15 x 2= 30 Nm
Hope you understood! :D
zubair_slipknot:
Thx a lot Hope
+rep
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