FREEE Neco 2017 Physics Practical Answers – June/July Expo

1)
s/n 1,2,3,4,5
d(cm) 90.0,80.0,70.0,60.0,50.0
t(s) 31.80,30.70,30.00,29.00,28.00
T=t/20(s) 1.590,1.540,1.500,1.450,1.400
d^-1(cm^-) 0.011,0.013,0.014,0.017,0.020
slope DT/d^-1
=1.590-1.400/0.020-0.011=0.19/0.009
=21.1cms

precautions
i)i ensured that the ruler is moving in an oscillatory manner and not rotational
ii)i ensured that the experiment was carried out in air and tight region for accuracy

1bi)
d=70.0cm

1bii)
the metre rule will be in equilibrium when the distance at each ends are equal to each other
!=========!!!!=====

3ai)
tabulate
s/n1,2,3,4,5,6
R(pie)6pie,5pie,4pie,3pie,2pie,1pie
V(v) 2.20 2.15 2.05 1.85 1.70 1.45
P(v) 0.76,0.81,0.91,1.11,1.26,1.51
I(A) 0.37,0.43,0.51,0.62,0.85,1.45

3aii)
E=2.96v

3ix)
slope=DI/DP=1.2-0.4/0.7-0.27=0.8/0.43=1.86Av^1
slope=1.86pie

3x)
K=5^-1
k=1/slope = 1/1.86 = 0.538pie^-1

3xi)
i)i ensured tight connections
ii)i ensured clean terminals

3b)
Ohm’s lawstates that the currentthrough a conductorbetween two points is directly proportionalto the voltageacross the two points.

3bii)
I=Total EmF/R+r
I=3E/R+3r

COMPLETED

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