pls explain these ones:q15) F=kv and F=mg are same
so kv=mg so v=mg/k
ke=1/2 m x v^2 substitute v and u get m^3 x g^2/2k^2
Is this is all u can do..Where is november 2003..well ill tell u something....u made this thread so ur the one who must start to help..if u have any doubts ask..if u want to help, pls do...but dont act as if we work for u and that we must post every year..we did enogh job..if u want it go look for itWhere is november 03??????
nov_10_13: 2 cant help u in this question u r suppose to noe dem by heartpls explain these ones:
nov_10_13: 2, 12, 14(some explain this before but i didn't get it), 25(answer why not D), 31
june_11_12: 6(why not B), 16, 17, 29, 31
just one more paper after this INSHA ALAH
its my great idea that you guys are working on. if you don't wanna help then don't bother. i didn't beg you to do all papers. you did it with your own wish. stop crying now.Is this is all u can do..Where is november 2003..well ill tell u something....u made this thread so ur the one who must start to help..if u have any doubts ask..if u want to help, pls do...but dont act as if we work for u and that we must post every year..we did enogh job..if u want it go look for it
ooh the GREAT FATIMA ooohhh..now ill leave u to cry for help with your GREAT own idea ooohhits my great idea that you guys are working on. if you don't wanna help then don't bother. i didn't beg you to do all papers. you did it with your own wish. stop crying now.
In q.6 the reason u gave makes both A and B the correct ans. How to know that A is the correct one?November 2007
Use base units and equate both sides.
Learn the approximations.
Resultant force is always is opposite direction of its two components in the triangle of forces.
Precision is the closeness of measured values.
Accuracy is the closeness of measured values to actual value.
P = fv
f = ma and v = s/t
P = add up all the % uncertainties.
%P = 0.1 + 1 + 1.5 + .5
= 3.1 %
Due to zero error, the initial value of angle of deflection will be greater than zero at zero current.
Basic concept that g gravity is the acceleration of free fall.
The gradient of velocity-time graph is acceleration.
Area of distance above x axis - area of distance below x axis.
(0.5 * 3 * 30) - (.5 * 2 * 20)
= 25 m
Driving force - frictional force = ma
12- Fre = 0.6(4)
12- 0.6(4) = Fre
9.6 N = Fre
View attachment 12245
Since the parachutist is falling, height is decreasing over time.
Gradient of distance-time graph is speed.
Use head to tail method.
At midpoint, d = 0.8/2 = 0.4m
Moment = F*d
12 = F * 0.4
30 N = F
Initial K.E. - Final K.E.
(0.5* 1000 *25^2) - (0.5 * 1000 * 5^2)
300 000 J
16 - C
At max d, K.E. = minimum and elastic potential energy = maximum.
Density = mass/volume
Hence higher density means a higher mass, hence more no. of atoms.
So MpNp > MqNq
Height at surface =?
Pressure = density * g* h
100 000= 1030 * 9.81 * h
9.896 m = h1
Height at 450 kPa =?
450 000 = 1030 * 9.81 * h
44.535 = h2
Therefore height below surface = 44.535 - 9.896
=34.639 ~ 34.6m
Strain energy = 1/2 * F * extension
= 0.5 * 25 * (0.4 - 0.2)
= 2.5 J
View attachment 12247
Learn the wavelengths.
Max speed = 2pii *a *f
f = ?
s = f* lamda
8 = f (50)
0.16 Hz = f
Max speed = 2pii * 2 * 0.16
Max K.E. = .5 m* v^2 = 0.5 * 2 * 10^-3 * 2^2
= 4 mJ
x = lamda * D/ a
Hence increasing the lamda, increases x, that is the fringe separation.
d sin theta = n* lamda
At n = 3, theta = 45 degrees
d sin45 = 3*lamdaa
0.7 d = 3 lamda
and max angle = 90 , so n =?
d sin90 = n*lamdaa
d = n* lamda
Using the ratio method:
If 0.7d = 3 lamda
1 d =?
cross multiply and you get n as 4.25 hence rounding it off to 4th order.
Since electric field direction is from higher p.d./charge to lower p.d./charge the electron will be attracted towards the more positively charged plate (or direction) hence to the left.
Direction of electric field is away from positive charge.
E = V*Q
E/Q = V
P = V^2/R
P = 12^2/Rx and P = 6^2/Ry
Rx = 144/P and Ry = 36/P
Rx/Ry = 144/P divided by 36/P
Rx/Ry = 144/36 = 4
V = IR
6 = I (10 +10)
0.3 A = I
Q = It
0.3 * 60 = 18 C
View attachment 12248
Basic concept of L.D.R.; when light intensity increases, resistance decreases hence voltage decreases too.
V in = R1/T.R. * V out
4.8 = 10/25 * V out
4.8* 25/10 = V out
12 = V out
Using the ratio method:
If 1.1 V - 0.7 m
? - 0.9 m
x = 0.9* 1.1/ .7
x = 1.4 V
The readings won't change because the set up is the same.
Charge is same since proton no. is same, but mass differs since no. of neutrons differs.
The alpha scattering experiment proves the small size of a gold nucleus.
In a beta emission, the nucleon no. remains same but the proton no. increases by 1
For 2 beta emissions, proton no will increase by 2 hence 40 +2 = 42
Momentum = mv, greater m = greater momentum.
hence the particle with the greatest mass from all the choices is A, an alpha particle.