Question

一道物理题，帮忙解决，急急急……感谢！！！！

alcohol of mass 0.5kg in a glass container of mass 0.4kg is heated by an immersion heater of power 300W.The initial temperature of the alcohol is 18℃.Neglecting any heat lost to the surrondings,estimate the time the immersion heater has to be switched on so that the alcohol begins to boil? (boiling point of alcohol=78℃)(specific heat capacity of alcohol=2500Jkg^-1℃^-1)(S.H.C of glass =600Jkg^-1℃^-1)我只剩下这点财富了，不要嫌少

Answer 1

(0.5*2500 + 0.4*600)*(78-18)/300=298秒