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2021 NECO GCE PHYSICS PRACTICAL ANSWERS

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(1)
Graph



(1aiv)
TABULATE
S/N: 1| 2| 3| 4| 5|
Mi(g): 70.0| 90.0| 110.0| 130.0| 150.0|
Yi (cm): 13.7| 14.5| 15.8| 16.4| 17.7|
Yi(con)(cm): 27.4| 29.0| 31.6| 32.8| 35.4|
Zi=Yi - Yo: 3.0| 4.8| 7.2| 8.4| 11.0|
Yo=12.2cm Y(cm)=24.4cm

(1bi)
(i)
- Upthrust
- Weight
(ii) The spring shortens

(1bii)
Energy = 1/2Ye²
0.135=1/2 × Y × (0.03)²
Y= 2 × 0.135 / 0.03 × 0.03
Y = 300N/m



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