(v)quad (12!)/((10!)2times1)

A brass rod of length 50 cm and diameter 3.0 mm is joined to a steel rod of the same length and diameter. What is the change in length of the combined rod at 250^(@)C , if the original lengths are at 40.0^(@)C ? The ends of the rod are free to expand (coefficient of linear expansion of brass =2.0 times 10^(-5)K^(-1) , steel =1.2 times 10^(-5)K^(-1) ).

The rate constant of a first order reaction at 300 K and 310 K are respectively 1.2 xx 10^(3) s^(-1) and 2.4 xx 10^(3) s^(-1) . Calculate the energy of activation. (R = 8.314 J K^(-1) mol^(-1))

Coefficients of volume expansion of benzene and wood are 1.2 times 10^(-3@)C^(-1) " and " 1.5 times 10^(-4@)C^(-1) respectively. Their respective densities at 0^(@)C are 900kg*m^(*-3) " and " 880kg*m^(-3). Find the temperatures at which wood will just immerse in benzene.

What will be de Broglie's wavelength of an electron moving with a velocity of 1.2 xx 10^(5) ms^(-1) ?

What will be de Broglie's wavelength of an electron moving with a velocity of 1.2 xx 10^(5) ms^(-1) ?

Rate constant k = 1.2 xx 10^(3) mol^(-1) L s^(-1) and E_(a) = 2.0 xx 10^(2) kJ mol^(-1) . When T rarr oo :

Rate constant k = 1.2 xx 10^(3) mol^(-1) L s^(-1) and E_(a) = 2.0 xx 10^(2) kJ mol^(-1) . When T rarr oo :