This is WAEC GCE 2016 PHYSICS PRACTICAL EXPO 



Pls Tabulate:

xi(cm)|yi(cm)|zi(cm)|W1(Nx10^-2)|W2(Nx10^-2)|u=(w1-w2)(Nx10^-2)|v=(w1-w3)(Nx10-2)
=>1.80|1.50|1.70|3.6|3.00|3.40|0.60|0.20
=>3.80|3.00|3.00|7.6|6.00|6.00|1.60|1.60
=>5.50|4.40|5.00|11.10|8.00|10.00|2.20|1.00
=>7.30|5.90|6.60|14.60|11.80|13.00|2.80|1.40
=>9.20|7.30|8.30|18.40|14.60|16.60|3.80|1.80
=>11.10|8.30|10.00|22.20|16.60|20.00|5.60|2.20

(1b)
Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity usually means relative density with respect to water.



(1bii)
Given volume of solid immersed
Vsi =1/2*30cm³
=15cm³
Density of liquid (water)ew= 1g/cm³
Acceleration due to gravity, g = 10m/s²
Upthrust, U= eVsi g
U= 1000*(15*10^-6)*10
U=15*10-²
U=0.15N

Weight of solid =mg
=EsVs g
given: Es=2.4g/cm³ (2400kg/m³)
Vs=30cm (30*10^-6 m³)
g=10m/s²

Weight, w=30*10^-6*2400*10
=72*10-²
=0.72N
Reading on spring balance =W-U
=0.72-0.15
=0.57N

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(3aiv)
Tabulate pls:

S/n: 1,2,3,4,5,6
R/ohms: 0.00,1.00,2.00,3.00,4.00,5.00
I/A: 3.00,1.00,0.60,0.45,0.35,0.25
P=(E/I) V ohms^-1: 0.500,1.500,2.500,3.333,4.286,6.000

(3vi)
s=Y1-Y2/X2-X1 = 4-2/3.6-1.5
=2/2.1
=0.952

(3vii)
C = 0.5ohms

(3viii)
Resistance

(3ix)
-I ensured that the circuit is open after each reading to maintain the E.M.F of the battery
-I ensured that the Zero Error of the Ammeter is checked and noted

(3bii)
V = 4.5v
R = 4ohms
I = 0.9A
V = I(R+r)
where r = internal resistance
4.5 = 0.9(4+r)
.:. 4+r = 4.5/0.9
4+r = 5
r = 5-4
= 1 ohm.

Good luck!!!