An aluminum wing on a passenger jet is 30m long when its temperature is 20 degrees C. At what temperature would the wing be 5 cm (0.05) shorter?
Coefficient of Aluminium = 25 X10^-6
/\L = alpha * L * /\T
0.05 = 0.000025 * 30 * /\T
0.05 = 0.00075 * /\T
0.05 / 0.00075 = /\T
/\T = 66.67 ---> 20 - 66.67 = -46.67 C
//\L = alpha * L * /\T
0.05 = 0.000025 * 30 * /\T
0.05 = 0.00075 * /\T
0.05 / 0.00075 = /\T
/\T = 66.67 ---> 20 - 66.67 = -46.67 C
. because the temperature is below zero, and
probably below you have ever encountered doesn't mean it doesn't
exist. A temperature of -46is cold, but not extremely cold
(theoretical lowest temperature possible -273.15
C).
A secondary reason is that the temperature should
be lower than the start temperature.heat expands things
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