Which type of heat transfer is used in most automobile engines to carry excess heat away from the hot engine?
A. natural convection of air falling over the cooling land
B. forced convection air or force convection of water
C. forced convection of water
D. natural convection of air rising over the warming land
C. forced convection of water
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A light ray strikes a hexagonal ice crystal floating in the air at a 30° angle to one face, as shown below. The hexagonal faces of the crystal are perpendicular to the plane of the page. All the rays shown are in the plane of the page, and nice = 1.30. Which outgoing ray is the correct one?
A. A B. B C. C D. D E. E
What are sources of light pollution and how do those affect astronomical observations?
What will be an ideal response?
We can study how galaxies evolve because
A) galaxies are transparent to visible light. B) we are really smart astronomers. C) we can watch as they interact in real time. D) the farther away we look, the further back in time we see.
The Pleiades (or Seven Sisters) an example of a(n) ________
Fill in the blank(s) with correct word