newlength=2m+(2*5e-4)(20)-2(6e-4)(40)=1.97m
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a steel rod was found to be 2 meters long at 20 degree celcious.when measured by a standard brass scale of length 1 meter at 0 degree celcious.find out the length of the same steel rod at 50 degree celcious as measured by the same brass scale at 40 degree celcious.where steel=5×10 to the power-four Kelvin inverse and brass=6×10 to the power-four celcious inverse
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