Two identical thin metal strips one of aluminium and the other of iron are riveted together to form a bimetallic strip. The temperature is raised by `50^(@)C`. If the central planes of the two strips are separated by 2nm and the coefficients of thermal expansion of aluminium and iron are respectively `30 xx 10^(-6)//^(@)C` and `10 xx 10^(-6)//^(@)C` the average radius of curvature of the bimetallic strip is about

Two thin metal strips, one of brass and the other of iron are fastened together parallel to each other. Thickness of each strip is 1 mm. If the strips are of equal length at 0^(@)C . The radius of the are formed by the bimetallic strip when heated to 80^(@)C is (Coefficient of linear expansion of brass = 19xx10^(-6)//""^(@)C & of iron = 12xx10^(-6)//""^(@)C ).

Two thin metal strips, one of brass and the other of iron are fastended together parallel to each other. Thickness of each strip is 2 mm . If the strips are of equal length at 0^(@)C . The radius of the are formed by the bimetaalic strip when heated to 80^(@)C is (Coefficient of linear expansion of brass =19xx10^(-6)//^(@)C & of iron= 12xx10^(-6)//^(@)C) .

Two simple pendulum with heavy bobs-one using iron wire and the other aluminimum wire are excited simultaneously. It is found that when the first pendulum completes 1000 oscillations the other completes 1001. When the temperature is raised by t^(@)C , it is found that the two pendulums now oscillate together. If he coefficients of thermal expansion of iron and aluminimum are 10 xx 10^(-6)//^(@)C and 30 xx 10^(-6)//^(@)C then the value of t is :

Two simple pendulum with heavy bobs-one using iron wire and the other aluminimum wire are excited simultaneously. It is found that when the first pendulum completes 1000 oscillations the other completes 1001. When the temperature is raised by t^(@)C , it is found that the two pendulums now oscillate together. If he coefficients of thermal expansion of iron and aluminimum are 10 xx 10^(-6)//^(@)C and 30 xx 10^(-6)//^(@)C then the value of t is :

A bimetallic strip is composed of two identical strips, one of steel and other of brass. When the temperature of the strip is raised by Delta T , it bends to form arc of curvature R. If the coefficients of linear expansion of steel and brass are alpha_1 and alpha_2 , respectively, then R is

A wire is made by attaching two segments together end to end. One segment is made of aluminium and the other is steel. The effective coefficient of linear expansion of the two segment wire is 19xx10^(-6)//^(@)C . The fraction length of aluminium is (linear coefficient of thermal expansion of aluminium and steel are 23xx10^(-6).^(@)C and 12xx10^(-6)//^(@)C ,

A wire is made by attaching two segments together end to end. One segment is made of aluminium and the other is steel. The effective coefficient of linear expansion of the two segment wire is 19xx10^(-6)//^(@)C . The fraction length of aluminium is (linear coefficient of thermal expansion of aluminium and steel are 23xx10^(-6).^(@)C and 12xx10^(-6)//^(@)C ,

A wire is made by attaching two segments together end to end. One segment is made of aluminium and the other is steel. The effective coefficient of linear expansion of the two segment wire is 19xx10^(-6)//^(@)C . The fraction length of aluminium is (linear coefficient of thermal expansion of aluminium and steel are 23xx10^(-6).^(@)C and 12xx10^(-6)//^(@)C ,

What should be the sum of lengths of an aluminium and steel rod at 0^(@)C is, so that all the temperature their difference in length is 0.25m . (Take coefficient of linear expansion for aluminium and steel at 0^(@)C as 22 xx 10^(-6)//.^(@)C and 11 xx 10^(-5)//.^(@)C respectively.)