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Weac physics pratical 2016 answer

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
1bi)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.
ii) 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
2bi)-It is used for Magnifying glass br /> For a magnifying glass to work, the object is
placed at the focal point such that the image
produced is magnified, upright and virtual.
- It is used in aSlide projector: a projector essentially uses a
convex lens to form on a screen a real, magnified
and inverted image of the slide or film. The slide,
being the object, is positioned between the j and 2f
from the lens.
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(3)
Tabulate pls br /> 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 would ensure that the circuit is open after each reading to maintain the E.M.F of the battery
-I would ensure that the Zero Error of the Ammeter is checked and noted
3b)Internal resistance of a cell is the resistance within a
battery, or other voltage source, that causes a
drop in the source voltage when there is a
current. There is, therefore, actual reduction in
the electromotive force of the cell , as well as an
increase in internal resistance.

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