2017 neco physics practical Answers

2017 neco physics practical Answers
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1i)
TABULATE
s/n, L(cm), t1(s), t2(s), t=t1+t2/2(s), T(s), 100T, log100T, logL
s/n 1, 2, 3, 4, 5
L(cm) 90.00, 85.00, 80.00, 75.00, 70.00
t1(s) 9.20, 8.90, 8.65, 8.20, 7.65
t2(s) 9.30, 9.00, 8.45, 8.10, 7.54
t=t1+t2/2(s) 9.25, 8.95, 8.55, 8.15, 7.59
T(s) 0.463 0.448 0428 0408 0379
100T 46.30 44.80 42.80 40.80 37.90
log100T 1.666 1.653 1.634 1.613 1.579
logL 1.954, 1.929, 1.903, 1.875, 1.845,
1x)
slope,S=change in log100T/change in logL
1bi)
couple is an occurence when two equal but oppositely directed parrallel force not acting straight line.
Moment of a couple is define as the product of the force and perpendicular distance between the line of action of the two forces
1bii)
Relationship:R=Mg+Mg
1biii)
centre of gravity of a body is the point at which its resultant weight seems to act.
Stability of an object depends on the position of the centre of gravity.
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2i)
TABULATE
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