2015 WAEC GCE PHYSICS 3 (Alternative to Practical Work) ANSWER IS READY.GET IT NOW - WORLDLYWAP.COM

2015 WAEC GCE NOV/DEC

EXAM DAY: THURSDAY

PAPER: PHYSICS 3 (Alternative to Practical Work)

(1a)
Tabulate.
Under s/n: 1,2,3,4,5
Under M(N): 140,120,110,84,66
Under tita(o): 24,32,38,51,62
Under Sin tita: 0.4067, 0.5299,0.6156, 0.7771,0.8829.
Note that 1cm =20N

(1aviii)
- I would ensure that the meter rules balanced before the readings.
- I would avoid error due to parallax

(1bi)
i. Total forces in one direction are equal to the forces in opposite direction.
ii. The algebraic sum of the moment of all forces about any point should be zero.

(1bii.)
The moment of force at equilibrium point o is equal to,
sum of clockwise moment = sum of anti- clockwise moment
OC*M=CD*W.

(3a)
(i)d1=1.40cm, d2=1.55cm, d3=1.75cm, d4=2.1cm, d5=2.3cm
Real values of di
d1=1.4*0.5=0.7mm
d2=1.55*0.5=0.77mm
d3=1.75*0.5=0.875mm
d4=2.1*0.5=1.05mm
d5=2.3*0.5=1.15mm

(ii)Ia1=2.4A, Ia2=3.8A, Ia3=5.0A, Ia4=7.4A, Ia5=11.6A
Ib1=2.4A, Ib2=3.6A, Ib3=5.2A, Ib4=7.5A, Ib5=11.6A

(iii)I=(Ia+Ib)/2
I1=(2.4+2.4)/2=2.4A
I2=(3.8+3.6)/2=3.7A
I3=(5.0+5.2)/2=5.1A
I4=(7.4+7.5)/2=7.45A
I5=(11.6+11.6)/2=11.6A

(3aiv)
logd1=log0.7=-0.15mm
logd2=log0.775=0.11mm
logd3=log0.875=0.06mm
logd4=log1.05=0.02mm
logd5=log1.15=0.06mm
logI1=log2.4=0.38
logI2=log3.7=0.57
logI3=log5.1=0.71
logI4=log7.45=0.87
logI5=log11.6=1.06

(3av)
TABULATE
S/N; 1,2,,3,4,5
di(cm);1.40,1.55,1.75,2.10,2.30
di(mm);0.70,0.78,0.88,1.05,1.15
Ia(A);2.4,3.8,5.0,7.4,11.6
Ib(A);2.4,3.6,5.2,7.5,11.6
I(A);2.4,3.7,5.1,7.5,11.6
logd!(mm);-0.15,-0.11,-0.06,0.02,0.06
logI1;0.38,0.57,0.71,0.87,1.06

(3avi)
|Slope(s)=change in logI/change in logd
=(0.87-0.57)/(0.02-(-0.11))
=0.3/0.13=2.3A

(3avii)
-I will ensure the circuit is open when no readings are not taken
-i will ensure tight connection

(3bi)
diameter(d)=1.09mm
(ii)
R=eL/A
R=(5.0*10^-2*0.01)/(pie/4)*(0.001)^2
R=(5*10^-4)/(0.7855*1*10^-6)
=6.37*10^2ohm
P=I^2R
=10^2*6.37*10^2
=6.37*10^4W
\
2015 WAEC GCE PHYSICS 3 (Alternative to Practical Work) ANSWER IS READY.GET IT NOW Reviewed by Simple_mind on 9/09/2015 Rating: 5