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JAMB Physics 2020 Paper

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Question : 28

Total: 38

The linear expansivity of brass is 2 x 10

^{-5}

^{\circ}\mathrm{C}^{-1}

. If the volume of piece of brass is 10cm

^{3}

^{\circ}

C. What will be its volume at 100

^{\circ}

C?

10.06cm $^{3}$
10.04 cm $^{3}$
10.02 cm $^{3}$
10.20 cm $^{3}$

Solution:

3 x $\alpha$ = $\frac{V_2 - V_1}{V_1 \times \Delta \theta}$

3 x 2 x 10 $^{-5}$ = $\frac{V_2 - 10}{100 \times 10}$

V $_{2}$ = (100 x 10 x 3 x 2 10 $^{-2}$ ) + 10

= 10.06 cm $^{3}$

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