physics mcq help needed! urgent!

[halosh92]

q 34 and 35 june 2002??

q34) if u look carefully ull notice that its the same exact circuit therefore same brightness
q35) R3 and R1 gets both of them 2V that means both have the same resistance and that is an only option u can find in C

[[Spy]]

2009 nov Q14
anyone?

which variant?

[halosh92]

please help

Q15: i have no idea
Q19: its a fact given in many books just learn it...i belive its somehting to do with the young modulus
Q29:
E=V/d    also
V=W/q

W=work=energy= 1/2mv^2 (ke)
therefore
V=1/2mv^2 /e
so
E = 1/2mv^2 /e /x
just rearrange and make "x" as the subject ull get the answer in D

[[Spy]]

please help

the mass in X is going to half, and so does the height!

which means E potential= 0.5mg0.5h=mgh/4

therefore answer is B

19) its just a fact, plastic deforemation means it will not go back to its original shape, BUT the question says SUTAIN THE LARGEST PLASTIC DEFORMATION basically the object that can be bent the most, it cant be any brittles ones cause brittle means they shatter, and a fact - aluminium is more bendable than steel and so answer is A


29) i think this one of the questions that require time and a mood i have an easier way of these questions, since motion is involved in this question, then A and B cant be the right answer because they have mv and NOT mv^2 (which is kinetic energy i.e motion) and since we're looking at the motion of the electron then we have to include its charge obviously, therefore answer is D

[ifraha18]

i dditn get the june 2002 q35..can u xplain agn.?

[ruby92]

M/J 2009
10 13 20 33

O/N 2009
10 14 13 29
20 is maxima n*2?
21 why is it not B??

[Phosu]

they didnt mention whether its elastic or non elastic.
and one more question why do they exchange velocities?

it doesn't matter, since momentum is conserved in both.
it may seem like they are exchangin velocites, but that is only to equate the momentum
2m leaves with v, momentum = 2mv
so m leaves with 2v, so that momentum =  2mv

[ifraha18]

nov 2002 q9..??

[halosh92]

nov 2002 q9..??

check for homogenity 

[astarmathsandphysics]

Can you post a link to this papers. Iam not sure if I have the right paper


Posts: 139


     
   
Re: physics mcq help needed! urgent!
« Reply #125 on: Today at 06:02:16 PM »
Quote  Modify  Remove  Split Topic
Quote from: ruby92 on Today at 11:05:50 AM
M/J 2009
10 13 20 33
O/N 2009
10 14 13 29
20 is maxima n*2?
21 why is it not B??

[ruby92]

...

[halosh92]

i dditn get the june 2002 q35..can u xplain agn.?

ok c over all its 5V the first resistor gets 2 volts, the second gets 1 volts, the 3rd gets 2volts also
so the 1st and 2nd resistors have same voltage, and same resistances
got it?

[astarmathsandphysics]

one mo

[astarmathsandphysics]

jun 09 10 and 13 here

https://studentforums.biz/index.php/topic,7771.msg206250.html#msg206250

20 Y=Fl/Ae so F=YAe/l Q has half the area and twice the length so 1/4 of the tension
33 I=V/R=4.2/18=0.47A

[astarmathsandphysics]

10 impulse =F*t=change in momentum
60*0.5 =30*3 -30*v v=(30-90)/-30=2m/s
13Tension =torque/radius of Q=3/0.1
torque on P=F*r=30*0.15=3.5
14 A horizontal component of velocity =r sin45=v/sqrt(2)
at top of motion this is the only component of velocity and sqyares to give factor 1/2
29 A use F=Eq