Physics · Elasticity
The elastic potential energy stored in a steel wire of length 20 m stretched through 2 cm is 80 J. The cross-sectional area of the wire is ______ mm2. (Given, Young's modulus Y = 2.0 × 1011 N/m2)
- 150
- 240✓
- 330
- 420
Correct answer
40
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