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(16) You know that the weight always acts at the centre.. so lets assume the distance XY to be 1m.
Somebody please helppppppppp these are my problems don't have any link pls
Physic As oct 2010 / 12 mcq 22 and 34
May 2011/12 mcq 15,16,24
May 2011/ mcq 14,15
Oct2011/13 mcq 17,25
Oct 2011/12 mcq 26
May 2012/12 mcq 5
Q 16
10*0.5L= Fcos O * L
Take L as 1m
You get the answer C
17 Sorry no idea but I got a picture View attachment 28821
(16) You know that the weight always acts at the centre.. so lets assume the distance XY to be 1m.
The horizontal component of force F is Fsin30.
Sum of clockwise moments = sum of anti-clockwise moments
0.5 x 10 = 1 x Fsin30
F = 10N
(17) The tension (4N) is the same on both sides; XY and XZ.
First, we have to find the angle YXP
Sin theta = 40/50
theta = 53
Next, find the horizontal component of the tension:
= 4cos53
= 2.4N
The same horizontal component will be experienced on XZ
Hence, 2.4 X 2
=> 4.8 N
Because 2 Mole of Salt gives 4 Mole of NO2 and 1 mole of O2. We need to calculate for 1 mole of salt, so all the moles will get divided by two. Hence we took the Mr for 2 moles of NO2 and 0.5 mole of O2. Hope you get it
PLEASE HELP ME
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s12_qp_11.pdf
Q21, Q22, Q23
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s12_qp_12.pdf
Q16, Q20, Q28
http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w12_qp_11.pdf
Q23, Q17
THANKS IN ADVANCE
MJ 2012 P11
Q21 See Na react with OH of both acid n alcohol
But Naoh reacts with acid only
When these react with one OH it get a charge of -1
...initially Na reacts with 3 Oh to -3.... That OH vould be of anyone of alcohol or acid.... Then Naoh reacts with one OH to give -1....
Now we know that Naoh only reacts with acid so there is one acid group..... N other r two acohols groups...so ans is c
Q22 We get ethanol n sodium ethanoate on hydrolysis
Get the Mr of both
Add them
This is ur total product mass
Now take % for each
Q23 See the product is an ester
And it is forming a ring
That means k it is joining with itself
To do that it must contain both alcohol n acid
So B is the one....
On collision, airbags in cars inflate rapidly due to the production of nitrogen.
The nitrogen is formed according to the following equations.
2NaN3 → 2Na + 3N2
10Na + 2KNO3 → K2O + 5Na2O + N2
How many moles of nitrogen gas are produced from 1 mol of sodium azide, NaN3?
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