a block of mass 10.0 kg starts at point At a height of 2.0 m above the horizonta

Question

a block of mass 10.0 kg starts at point At a height of 2.0 m above the horizontal and slides down a frictionless incline. it then continues sliding along the horizontal surface of a table that has friction. The block comes to rest at point C, a distance of 1.0 m along the table surface. how does the internal energy of the system change? MCQ 14.1 A block of mass 10.0 kg starts at point A at a height of 2.0 m above the horizontal and slides down a frictionless incline. It then continues sliding along the horizontal surface of a table that has friction. The block comes to rest at point C, a distance of 1.0 m along the table surface. How does the internal energy of the system change? Frictineles A) Increases between A and B B) Increases between B and C C) Decreases between B and C D) Decreases between A and C E) Stays the same between B and C 0 m S. Stefanoski Benedictine University Chapter 14-Heat Heat

Explanation / Answer

Look at point B, the block has only kinetic energy that is accumulated by the block due to loss of potential energy and has ZERO internal energy.

Means -

At point B, (1/2)*m*v^2 = m*g*h

=> v^2 = 2*9.81*2

=> v = 6.3 m/s

this velocity becomes ZERO at point C.

Means this energy is utilized in doing the work against the friction and in increasing the internal energy of the block.

So, the internal energy of the block increases from point B to the point C.

Hence option (B) is the correct answer.

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