The coefficient of linear expansion of iron is 0.000011 per K . An iron rod is 10 m long at 27 C . The length of rod will decreased by 1.1 mm , when the temperature of rod changes to ?
1 ) The coefficient of linear expansion of iron is 0.000011 per K . An iron rod is 10 m long at 27 C . The length of rod will decreased by 1.1 mm , when the temperature of rod changes to : -
A ) 11 C , B ) 17 C ,
C ) 91 C , D ) None of these ,
Correct Answer : — B ) 17 C ,
Solution : -
∆ L = L˳ α ∆ t ,
So , ∆ t = ∆ L / L˳ α ,
∆ t = ( 1.1 x 10 ^ ( — 3 )) / ( 1.1 x 10 ^ ( — 6 ) x 10 ) ,
∆ t = 10 .
So ,
T = 27–10 = 17 C , Answer .
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2 ) The length of a spring α when a force of 4 N is applied on it and the length is β when 5 N is applied . The length of spring when 9 N force is applied is ?
Solution : -
