Ametal cube of side 6cm at 20 degree Celsius on
heating to 600 degree Celsius increases by 0.3cm
calculating the coefficient of linear expansion
coefficient of superficial expression
coefficient of cubical expansion

We have the following from the question;The coefficient of linear expansion is 8.6 * 10^-5The coefficient of superficial expression is 1.72 * 8.6 * 10^-4The coefficient of cubical expansion is  2.5  * 10^-4What is the linear expansivity?Let us recall that the term linear expansivity has to do with the increase in length, per unit length, per degree Kelvin rise in temperature. Now we know that we have the following information from the question;Initial length =  6cmIncrease in length = 0.3cmInitial temperature = 20 degree CelsiusFinal temperature =  600 degree CelsiusWe then have;coefficient of linear expansion = e/l1(T2 - T1)e = extensionl1 = initial lengthT2 = Final temperatureT1 = initial temperature coefficient of linear expansion = 0.3/6(600 - 20)= 8.6 * 10^-5coefficient of superficial expression = 2( 8.6 * 10^-5)= 1.72 * 8.6 * 10^-4coefficient of cubical expansion = 3(8.6 * 10^-5)= 2.5  * 10^-4Learn more about linear expansion:https://brainly.com/question/14780533#SPJ1