A bullet of mass 20 g enters into a fixed wooden block with a speed of 40 m/s and stops in it....

Question:

A bullet of mass 20 g enters into a fixed wooden block with a speed of 40 m/s and stops in it. Find the change in internal energy during the process.

Energy conservation

Conservation of energy states that energy is always conserved. Energy is not created or destroyed but converts from one form to another. This law suggests that perpetual motion machine of first kind (PMM1) is not possible.

Answer and Explanation:

Given :

Mass of bullet m = 20 g =0.02 kg

Inital velocity of bullet u = 40 m/s

Final velocity of bullet v = 0 m/s

Change in kinetic energy is :

{eq}\Delta KE = \frac{1}{2}mu^2-\frac{1}{2}mv^2=\frac{1}{2}(0.020)(40^2-0)=16\ J {/eq}

Change in kinetic energy of bullet = Change in internal energy of block

Change in internal energy during the process is 16 J.


Learn more about this topic:

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Energy Conservation and Energy Efficiency: Examples and Differences

from Geography 101: Human & Cultural Geography

Chapter 13 / Lesson 9
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