Answer/Explanation:
m= 2kg
t= 40s
P= 100J/s
C= 400J/kg°C
Q= P×t
= 100×40= 4000J
Q= m×C×∆t
4000= 2×400×∆t
∆t= 4000/(2×400)
∆t= 5°C
P stands for power
Q is heat energy, and we know that power multiplied by time gives amount of energy (which in this case is heat energy)
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