A molten metal of mass 150 g is kept at its melting point 800 C. When it is <br />allowed to freeze at the <br />same temperature. It gives out 75,000 J of heat energy./>(a) What is the specific latent heat of the metal(b) If the specific heat capacity of metal is 200 J kg K. how much additional be heat energy will the metal give out in cooling to-50 C ?
Answers
The amount of heat given out is 22500 J.
Explanation:
- Let L be the latent specific heat of the metal.
- When the metal is allowed to be solidified its mp i.e. 800 ∘C.
It will give out latent heat only.
mL=75000
0.150×L=75000
L=500000 Jkg −1
Now,
Heat given out by the metal in cooling down to - 50∘C.
Fall in temperature will be 800∘C − (−50 ∘C) = 850 ∘C
Heat given out= m×s×t=(0.150×200×850)=25500 J
Thus the amount of heat given out is 22500 J.
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kaif41327
26.01.2020
Physics
Secondary School
+5 pts
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A molten metal of mass 150 g is kept at its melting point 800 C. When it is <br />allowed to freeze at the <br />same temperature. It gives out 75,000 J of heat energy./>(a) What is the specific latent heat of the metal(b) If the specific heat capacity of metal is 200 J kg K. how much additional be heat energy will the metal give out in cooling to-50 C ?
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The amount of heat given out is 22500 J.
Explanation:
Let L be the latent specific heat of the metal.
When the metal is allowed to be solidified its mp i.e. 800 ∘C.
It will give out latent heat only.
mL=75000
0.150×L=75000
L=500000 Jkg −1
Now,
Heat given out by the metal in cooling down to - 50∘C.
Fall in temperature will be 800∘C − (−50 ∘C) = 850 ∘C
Heat given out= m×s×t=(0.150×200×850)=25500 J
Thus the amount of heat given out is 22500 J.