A Very Light 1

question 65

Multiple Choice

A very light 1.00-m wire consists of two segments of equal length,one of steel (Young's modulus is 2.00 × 10¹¹ N/m²) and one of brass (Young's modulus is 9.0 × 10¹⁰ N/m²) .The steel segment is 1.50 mm in diameter,and the brass segment has twice this diameter.When a weight w is hung from the ceiling by this wire,the steel segment stretches by 1.10 mm.By what distance does the brass segment stretch?

• A)0.50 mm
• B)0.61 mm
• C)1.2 mm
• D)2.4 mm
• E)9.8 mm

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