288KJ is conducted across two opposite faces of a 3m cube of temperature gradient 90ºCm\(^{-1}\) in 7200s. Calculate the thermal conductivity.

A sonometer's fundamental note is 50Hz, what is the new frequency when the tension is four times the original?

Which of the following is not a part of model rocket?

A thick glass tumbler cracks when boiling water is poured into it because

How much joules of heat are given out when a piece of iron, of mass 60g and specific heat capacity 460JKg\(^{-1}\)K\(^{-1}\), cools from 75ºC to 35ºC