The path of the light in raindrops that produces a single rainbow consists of
A. 2 refractions
B. 3 refractions
C. 2 total internal reflections
D. 2 refractions and 1 total internal reflection
Ans: D. 2 refractions and 1 total internal reflection
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When a propeller airplane takes off, how is momentum conserved?
a. Momentum is not conserved, because the airplane goes from being still to moving. b. Momentum is conserved only because the earth moves as the airplane takes off. c. Momentum is conserved because molecules in the air move as the propeller pushes them. d. Momentum is conserved because molecules in the air move on average in all directions. e. Momentum is conserved because another airplane has to take off from the other side of the earth at the same time.
Density: A hollow sphere of negligible mass and radius R is completely filled with a liquid so that its density is ?. You now enlarge the sphere so its radius is 2R and completely fill it with the same liquid. What is the density of the enlarged sphere?
A. 8 ? B. 4 ? C. ?/2 D. ? E. ?/8
A stars total velocity is a combination of its ________ and ________ velocities
Fill in the blank(s) with correct word
Web designers measure relative font sizes as a percentage of an em unit.
Answer the following statement true (T) or false (F)