Problem 1.15. The dye is cast (a) What would you observe when a small amount of

Question

Problem 1.15. The dye is cast (a) What would you observe when a small amount of black dye is placed in a glass of water? (b) Suppose that a video were taken of this process and the video run backward without your knowledge. Would you be able to observe whether the video was being run forward or back- ward? (c) Suppose that you could watch a video of the motion of an individual ink molecule. Would you be able to know that the video was being shown forward or backward? Problem 1.16. Fluid as metaphor Why is "heat" treated as a fluid in everyday speech? After all, most people are not familiar with the caloric theory of heat. Problem 1.17. Do molecules really move? Cite evidence from your everyday experience that the molecules in a glass of water or in the surrounding air are in seemingly endless random motion.

Explanation / Answer

(a) The dye in the glass of water appears as a spherical ball.

(b) the video runs backward, because the speech in the viedo will not the same as the forward.

(c) Forward.

16) The heat moves from high temperature to low temperature. So the force gradient is temperature which is responsible for the heat to drive.

17)Molecules in the air moves but the molecules in the glass of water vibrates.

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