Answer:
Energy is the property of matter and radiation which is manifest as a capacity to perform work.
<h2>The ice melted is nearly 2.8 kg </h2>
Explanation:
The quantity of heat required to melt the ice can be found by the relation .
ΔQ = m x L
here L is used for the latent heat of fusion .
Its value is 334 J per gram for ice .
Thus m = = = 2836 gram
or = 2.8 kg approx
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B It’s a physical change because the water and the salt kept their original properties.</span>
Answer:
efficiancy=40 percent
Explanation:
efficiency=energy output/energy input×100
efficiancy=8J/20J×100
efficiancy=0.4×100
efficiancy=40 percent
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