(a) The tension in a wire is increased quasi-statically and isothermally from F; to Ff. If the length, cross-sectional area, and isothermal Young's modulus of the wire remain practically constant, show that the work done is W 24Y (b) The tension in a copper wire 1 m long and 0.001 cm² in area is increased quasi- statically and isothermally at 20°C from 10 to 100 N. How much work is done if the isothermal Young's modulus at 20°C is 1.23 × 10' N/m²?
(a) The tension in a wire is increased quasi-statically and isothermally from F; to Ff. If the length, cross-sectional area, and isothermal Young's modulus of the wire remain practically constant, show that the work done is W 24Y (b) The tension in a copper wire 1 m long and 0.001 cm² in area is increased quasi- statically and isothermally at 20°C from 10 to 100 N. How much work is done if the isothermal Young's modulus at 20°C is 1.23 × 10' N/m²?
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Transcribed Image Text:3.8. (a) The tension in a wire is increased quasi-statically and isothermally from F; to
F. If the length, cross-sectional area, and isothermal Young's modulus of the
wire remain practically constant, show that the work done is
L
2AY (3-3).
W
(b) The tension in a copper wire 1 m long and 0.001 cm² in area is increased quasi-
statically and isothermally at 20°C from 10 to 100 N. How much work is done if
the isothermal Young's modulus at 20°C is 1.23 × 10!" N/m²?
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