Ask Question
5 October, 06:07

A 21.6-kg cube made from aluminum is at its melting temperature of 660℃. If you were to add 8000 kJ worth of energy as heat, what percent of the block melts? You might need the following: α = 23.0 ✕ 10-6 K-1, β = 69.0 ✕ 10-6 K-1, c = 900 J/kgK, LF = 3.98 ✕ 105 J/kg

+4
Answers (1)
  1. 5 October, 06:18
    0
    The percentage of block melts is 93.1 %

    Explanation:

    Let the block melted be m₁

    Given: LF = 3.98 * 10⁵ J/kg

    Amount of heat added, Q = 8000 KJ = 8*10⁶ J

    Using:

    Q = m₁*LF

    8*10⁶ = m₁ * 3.98 * 10⁵

    m₁ = 20.1 kg

    So, the percentage of block melts, % = m₁/m * 100

    % = 20.1 / 21.6 * 100 = 93.1 %

    The percentage of block melts is 93.1 %
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “A 21.6-kg cube made from aluminum is at its melting temperature of 660℃. If you were to add 8000 kJ worth of energy as heat, what percent ...” in 📘 Physics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers