Express `-40^(@)C` in the `""^(@)F` scale.

A steel scale is error-less at 50^(@)F . Using the scale, the length of a brass rod is found to be 1.5 m at 50^(@)C . What is the true length of the rod at 100^(@)C ? (Coefficients of linear expansion of steel and brass are 11.2 times 10^(-6@)C^(-1) " and " 18 times 10^(-6@)C^(-1) respectively.)

Express 40^@16'24'' in radian.

Express (cos20^@-cos40^@) in sine form

C_40H_56 is the

C_(40)H_(56) is the

If the average temperature of a place be 105.5^(@) F in Fahrenheit scale. What is the average of the same in centigrade scale.

If y=f(x)=(lx+m)/(nx-l) , express f(y) in the simplest form in x.

A barometer with a brass scale reads 75.34 cm at 25^(@)C . The scale was graduated at 20^(@)C. What will be the reading of the barometer at 0^(@)C ? Coefficient of linear expansion alpha for brass =18 times 10^(-6@)C^(-1) and coefficient of linear expansion gamma for mercury =18 times 10^(-5@)C^(-1).