If we use 67 W of power to heat 148 g of water, how long will it take to raise the temperature of the water from 15°C to 25°C? The specific heat of water is 4190 J/kg•K.
A) 93 s
B) 5.3 s
C) 22 s
D) 114 h

Question

Quizplus · Accepted Answer

To find the time, use the formula: Q = mcΔT, where Q is the heat energy, m is the mass, c is the specific heat, and ΔT is the temperature change. First, convert the mass to kg (0.148 kg) and calculate Q: Q = 0.148 kg * 4190 J/kg•K * (25°C - 15°C) = 6202 J. Then, use the power formula: Power = Q / time, so time = Q / Power = 6202 J / 67 W ≈ 93 s.

If We Use 67 W of Power to Heat 148