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Neco_2015_Physics_Practical_

Answers Practicals (1)
Tabulate
G=50cm, m1=50g, M=80g
Sn:1,2,3,4,5
AG(g): 5.00, 10.00, 15.00,20.0, 25.0
d(cm): 40.00, 35.00, 30.00, 25.00, 20.00 d2(cm): 17.00,15.00,12.50, 10.50, 8.50
d3(cm): 18.00, 15.00, 13.00, 11.32, 9.00
T(cm): 23.00, 20.00, 17.50,14.50, 12.00
U(cm): 22.00,20.00, 17.00, 13.68, 13.68, 11.00

precautions:
-i avoided draught effect during the experiment -i balanced the meter
rule horizontally on the knife
edge before
taking my readings
-i avoided parallax error on the metre rule

(1bi)
-it means the mass of a substance ratkion to the ratio of equal
volume of meter is 0.8

(1bii)
the density of the mass of hanger of mass 50g can
be determined
by dividing the mass of 50kg to the volume of the mass of hanger. (3)Tabulate:
Sn:1,2,3,4,5,6
L(cm):10.0, 20.0,30.0,40.0,50.0,60.0,70.0
V(volt): 0.15,0.25, 0.35, 0.50,0.60,0.70
L^-1(cm^-1):0.100, 0.50,0.033,0.025,0.020,0.016
V^-1(v^-1):6.667, 4.000, 2.857, 2.000, 1.667,1.429 precautions:
-i connected all the wires tightly together.
-i avoided dragging of the jockey on the
potentiometer wire.
-i avoided zero error on the voltmeter used.
i ensured that the key is opened after each reading 

(3b)
-potentiometer gives accurate value than a
voltmeter
-potentiometer measures no current at full scale
deflection
but voltmeter measures current (3bii)
I=E/(r R)
E=Ir IR
E-IR=Ir
lost volt=E-IR

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