The 1.30-kg head of a hammer has a speed of 7.3 m/s just before it strikes a nail and is brought to rest estimate the temperature rise of a 14-g iron nail generated by 8.0 such hammer blows done in quick succession. assume the nail absorbs all the energy. the specific heat of iron is 450 j/kg⋅c∘.

The rise in temperature is

Solution:

As per the question:

Mass of hammer, M = 1.30 kg

Speed of hammer, v = 7.3 m/s

Mass of iron,

No. of blows, n = 8

Specific heat of iron,

Now,

To calculate the temperature rise:

Transfer of energy in a blow = Change in the Kinetic energy

For 8 such blows:

Now, we know that:

your answer would be fusion

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