1i) Centre of gravity =50.5 TABULATE S/N|A(cm)| B(cm) 1 |10.0 | 51.90 2 |15.0 | 53.50 3 |20.0 | 53.80 4 |25.0 | 54.90 5 |30.0 | 55.80 1a) Slope = Change in Y/Change in X = Y2 – Y1 / X2 – X1 = 51.50 – 50.00/25.00 – 20.00 = 1.50/5.00 = 0.30 Ki = (1 – 2S / S)100 = (1 – 2 x 0.30 / 0.3)100 = 1.33 K2 = 2C/S – 160 = 2×44.50/0.3 – 160 = 136.67 (1xii) -I avoided the effect of draught during the experiment -I avoided error due to parallax on the metre rule -I balanced the metre rule horizontally on the knife edge before taking my readings (1bi) Moment of a force about a point is the product of the force and its perpendicular distance from the point to the line of action of the force. i.e moment=force*time and its unit is Nm (1bii) -Sum of forces acting in one direction must equal to the forces acting in another direction. -The algebraic sum of moment acting about a point must be equal to zero (3a) TABULATE S/N|E(v)|V(v)|I(A)|V^-1(v^-1)| I^-1(A^-1) 1 |1.50|0.80|0.40| 1.250 |2.500 2 |3.00|1.40|0.70| 0.714 |1.429 3 |4.50|2.00|1.00| 0.500 |1.000 4 |6.00|2.50|1.20| 0.400 |0.833 5 |7.50|3.20|1.50| 0.313 |0.667
precautions====== … -I tightened all the wires tightly together -I ensured clean terminals -I avoided zero error on the ammeter used (3bi) -By using electric cells -By using electrostatic method (3bii) For parallel connection=1/R=1/R 1/R 2Rt=R Rt=R/2ohm Total:(R/2) 2 4:(R/2) 2 4:(R 4)/2 8=R 4 8-4=R R=4ohm (4) Ohm ’ s Law . The current flow through a metallic conductor is directly proportional to the potential difference provided that temperature and other physical conditions are constant. (4b) Factors that determine resistance of conduction. PL Loading… A i – Nature Of the materials . ii – Length of the conducting wire. iii – Cross setional area . iv – Temperature . How Temperature affects Conduction. ======================= Answer => How Temperature affects Conduction Is that The more the temperature will be the resistance . (If neccessary) . (4c) Since the lost volt have developed across the cell when the supplied volt across the resistance onces will be affected
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