Span of bridge is 2.4 km. At `30^@C` a cable along the span sags by 0.5 km. Taking `alpha=12xx10^(-6)//^@C`, change in length of cable for a change in temperature from `10^@C` to `42^@C` is

Distance between two places is 200 km. alpha a of steel is 12xx10^(-6)//""^(@)C . Total space that must be left between steel rails to allow for a change of temperature from 36^(@)F to 117^(@)F is

A second's clock with a iron pendulum is constructed so a to keep correct time at 10^(@)C . Give alpha_("iron")=12xx10^(-6) per ""^(@)C . What will be the change in the rate when the temperature rises to 25^(@)C ?

A steel wire of cross section 1 mm2 is heated at 60^(@) C and tied between two ends family. Calculate change in tension when temperature becomes 30^(@) C coefficient of linear expansion for steel is alpha = 1.1 xx 10 ^(-5) "”^(@)C ^(-1), Y =2 xx 10 ^(11) Pa. (Change in length of wire due to change in temperature (Delta t) is Delta l = alpha l Delta t)

A conductor has a cross-section of 15 mm^(2) and resistivity of 7.6 xx 10^(-8)Omega m at 0^@C . If the temperature coefficient of resistance of the material of the conductor is 5 xx 10^(-3).^(@)C^(-1) , calculate its resistance for 2 km length of conductor when its temperature is 60^@C .