Why does a cloud collapse rapidly at first, and then slow down as it gets denser?
What will be an ideal response?
The self-gravity causes the cloud to collapse. Gravitational potential energy is turned to heat (through friction) and released as infrared light from the cloud. As the cloud continues to collapse and becomes smaller and denser, molecules collide more frequently and do not have time to release their excess energy as photons. The thermal energy in the cloud is trapped and its temperature rises. The rising temperature increases the pressure and slows down the collapse.
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A) No, the Milky Way galaxy is not expanding. B) No, the distances between the galaxies are not expanding. C) Both of the above are correct. D) Yes.
To which group of polymers does Dacron belong?
a. Natural b. Hydrolytic c. Addition d. Condensation
When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to produce bouncing is by the
A) ball. B) floor. C) need more information
If a circle has a radius of 1.109 m, what is its area expressed to the correct number of significant figures?
A) 3.86 m2 B) 3.863 m2 C) 3.864 m2 D) 3.8638 m2 E) 3.86379 m2