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Posted by on Wednesday, January 30, 2013 at 5:35pm.

A 123 g cube of ice at 0◦C is dropped into 1.9 kg of water that was originally at 81◦C.
What is the final temperature of the water after after the ice melts? The latent heat of fusion of water is 3.33 × 105 J/kg .
Answer in units of ◦C

  • Physics - , Wednesday, January 30, 2013 at 5:59pm

    You have collected exactly 2800 aluminum cans for recycling, each with a mass of 13.6 g. How much energy is needed to melt them if their initial temperature is 26.2◦C? Assume the specific heat, the latent heat and the melting point of aluminum are 899 J/kg ·◦ C,
    3.97 × 105 J/kg and 660.4 ◦C, respectively. Answer in units of J

  • Physics - , Wednesday, January 30, 2013 at 6:52pm

    Ice:
    Q= λm + cm(t-0) = λm + cmt
    Water
    Q=cm₁(81-t)

    λ=3.33•10^5 J/kg .
    m=0.123 kg
    m₁ = 1.9 kg
    c = 4186 J/kg •◦ C

    λm + cmt= c m₁(81-t)
    Solve for ‚t’

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