Two substances P and Q are heated by using similar heating devices. The mass of P and Q are 100 g and 75 g, respectively. The initial temperature of P is `35^(@)C` whereas the initial temperature of Q is `25^(@)C`. If the temperature of the substance 'P' is increased to `75^(@)C` in 40 minutes, determine the time required to raise the temperature of Q to the same value. The specific heat capacity of P and Q are 0.9 cal `g^(@)C^(-1) and 0.6" "cal" "g^(@)C^(-1)`, respectively.

Explanation

`Q=msDeltat`
Determinet he heat energy required to icnrease the determine the heat energy required to increase the temperature through the given value for both the substances. Also determine the heat energy produced by the heating device per minute. Determine the time taken to produce the requrid amount of heat energy in the case of substance.