The brilliancy of a gem is a function of its
a. index of refraction.
b. index of reflection.
c. size.
d. luster.
a
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An x-t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 6 s the velocity of the ball is zero. We can be positive that at t = 6 s,
a. the slope of the curve is non-zero. b. the acceleration is constant. c. the ball has stopped. d. none of the above answers is always correct.
Assume that the tile vectors for tiles on the surface shown below point toward us. What is the sign of the current i that flows through this surface?
A. The signed current i is positive.
B. The signed current i is negative.
C. The signed current i is zero.
D. One cannot determine i’s sign from what is given.
The proton-proton chain is ________
A) another name for the force that holds protons together in atomic nuclei B) the linkage of numerous protons into long chains C) the specific set of nuclear reactions through which the Sun fuses hydrogen into helium D) an alternative way of generating energy that is different from the fusion of hydrogen into helium
The cosmological redshift is not really a velocity at all, but a measure of the expansion of space-time
Indicate whether the statement is true or false