Answer:

Explanation:
As we know that the power emitted by the source is given as

now we know that

now we know that energy density is given as

now we have


intensity is defined as

now we have
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now we have



here we have



now we have


Energy required = mass x specific heat x temperature difference
= 0.5 x 4.19x10^3 x 2
= 4190J
I think wind is anther answer
Answer:
Explanation:I Did the test and it said this was the right answer so it probally is
Here as we can see there we be net horizontal force acting on it

also we know that

now we will have


now for net force of box we know




so acceleration of the box will be 2.52 m/s/s