A heater is used for 5 minutes to heat 500 g of water from 20C to 50C. What is the power of the heater? The specific heat capacity of water is 4.2 J/gC.
Answers
Answered by
5
Given info : A heater is used for 5 minutes to heat 500 g of water from 20°C to 50°C.
To find : the power of the heater if the specific heat capacity of water is 4.2 J/g/C is..
solution : first we should find the energy needed to heat the 500g of water from 20°C to 50°C.
energy needed to raise the temperature of water, Q = msΔ
= 500g × 4.2J/g/°C × (50°C - 20°C)
= 500 × 4.2 × 30 J
= 63000 J
now the power of heater = energy dissipated by heater/time taken
= 63000 J/5 min = 63000/300 = 210 W
therefore the power of the heater is 210 Watt.
Similar questions