Question

Find the time taken by a $500W$ heater to raise the temperature of $50kg$ of material of specific heat capacity $960Jk{g}^{-1}{K}^{-1}$ from ${180}^{o}C$ to ${200}^{o}C$. (Assume that all the heat energy supplied by heater is given to the material.)

• A. $32minutes$
• B. $16minutes$
• C. $50minutes$
• D. none of the above

Answer 1

The correct option is A $32minutes$

$P=500W$

$Q=50\times 960\times (200-180)J$

$t=Q/P=1920sec=32min$