A body of mass 11kg is suspended from a ceiling fan by an aluminum wire of length 2m and diameter 2mm. Calculate the elastic energy stored in the wire [Young's modulus of aluminum is 7.0 x 10¹⁰Nm^-2, g = 10ms^-2, \(\pi\) = 3.142]`

1.1 x 10^-1J

5.5 x 10^-2J

1.1 x 10^-4J

5.5 x 10^-8J

Correct answer is B

e = \(\frac{4FI}{Y \pi d^2} = \frac{4 \times 11 \times 10 \times 2}{7 \times 10^3 \times 3.14(2 \times 10^{-2})^2}\)

= 0.001m

E = \(\frac{1}{2} Fe = \frac{1}{2} \times 110 \times 0.001\)

= 5.5 x 10^-2J

See all Physics questions & answers

See more WAEC questions & answers

A body of mass 11kg is suspended from a ceiling fan by an aluminum wire of length 2m and diameter 2mm. Calculate the elastic energy stored in the wire [Young's modulus of aluminum is 7.0 x 1010Nm-2, g = 10ms-2, \(\pi\) = 3.142]`

Aptitude Tests

A body of mass 11kg is suspended from a ceiling fan by an aluminum wire of length 2m and diameter 2mm. Calculate the elastic energy stored in the wire [Young's modulus of aluminum is 7.0 x 10¹⁰Nm^-2, g = 10ms^-2, \(\pi\) = 3.142]`