WAEC 2020/2021 Physics Practicals OBJ Theiry/Essay questions and answers is out

(1)

S|N; 1|2|3|4|5|

M(g); 40.0|60.0|80.0|100.0|120.0|

X(cm);37.50|25.01|8.75|15.00|12.50|

X-¹(cm-¹); 0.027| 0.040|0.|053|0.067|0.08|

X-¹(x10-³); 27.00|40.00|53.00|67.00|80.00|

G=50.0cm

Y=30.0cm

Slope =∆M/∆X^-1= M2-M1/(X^-1) - (X^-1)

S= 120.0 -40/80.0-27

S= 80/53

S=1.509*10^3

S=1509

(x)

S=ymo

1509=30mo

mo=1509/30

mo=50.3

(1xi)

(i)Measure readings accurately

(ii)Avoid error due to parallax

(1bii)

CWM = ACWM

60*25 = x *30

30x = 1500

Divide through by 30

30x/30 = 1500/30

x=50g

The mass that should be placed at the 80cm mark of the meter rule to balance it horizontally is 50g

(1bi)

Moment of a force can be defined as the product of the force and its perpendicular distance from its point of action.

(1a) 

Typing...... 

(1bi) Moment of a force can be defined as the product of the force and its perpendicular distance from its point of action.

(1bii) 

Typing...... 

(3a) 

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(3bi)

(1) connecting cells in parallel adds the current capacities together.

(2) connecting cells in parallel provides alternative Pathways for Current flows.

(3) When cells are connected in parallel the Total voltage provided do not change

(3bii) 

(i) Resistance.

(ii) Tolerance.

(iii) Rated Power Dissipation.

(iv) Package and mounting.

(iv) Voltage rating.

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