Friday 4 April 2014

[WAEC] Physics Practical Answers


SEE ANSWER BELLOW

No 1 (VII) S/N: 1,2,3,4,5 D: 140,120,100,80,60 T (second): 4.8,4.1,3.3,2.6,1.9 

W: 29.17,29.26,30.3,30.76,31.58 V: 58.33,58.53,60.6,61.52,63.15 (3) I=0.35A

PLS DRAW A TABLE. i: 1,2,3,4,5 Xi(cm): 20.0,35.0,45.0,60.0,80.0 x^-1: 0.0500,0.0285,0.0222,0.0167,0.0125 I(A) : 1.50,1.45,1.35,1.30,1.25. =======

NOTE: ^ means raise to power. i: means that under i, u will get 1,2,3,4,5.. ========

3xi.
1. i ensured that the key is not closed when no reading are not taken.
2. i ensured the circuit parameters are tightly connected to ensure accurate result.
3. i ensured that the jockey touches the exact point on the potentiometer wire.

3bi. Emf of a battery is the potential difference between the terminals of a cell when no current flows in the circuit. 3bii.

(3bii) Given, Vx=1.018V Lx= 50.0cm Vy=? Ly=75.0cm Vx/Lx = Vy/Ly 1.018/50 = Vy/75 Vy= (1.018 * 75)/50 Vy= 1.527V


(1bi) Velocity Ratio(V.R) = i/ sin(tita) = 1/(h/d) V.R = D/h h= height of inclined plane

(1bii) mass of object(m)= 5kg Angle of inclination(tita)= 30degree Force(F) Perpendicular to the plane is F= mg Sin(tita) F= 5*10*Sin30(degree) F= 25N

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