Ask Question
1 June, 16:37

John heats 1 kg of soup from 25 °C to 70 °C for 15 minutes by a heater. How long does the same heater take to heat 1.5 kg of the same kind of soup from 20 °C to 80 °C? The energy output per unit time by the heater is constant.

+5
Answers (1)
  1. 1 June, 19:34
    0
    30 minutes

    Explanation:

    Energy per time is constant, so:

    E₁ / t₁ = E₂ / t₂

    m₁C₁ΔT₁ / t₁ = m₂C₂ΔT₂ / t₂

    (1 kg) C (70°C - 25°C) / 15 min = (1.5 kg) C (80°C - 20°C) / t

    (1 kg) (45°C) / 15 min = (1.5 kg) (60°C) / t

    3/min = 90 / t

    t = 30 min
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “John heats 1 kg of soup from 25 °C to 70 °C for 15 minutes by a heater. How long does the same heater take to heat 1.5 kg of the same kind ...” in 📙 Physics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Search for Other Answers