In the context of the Sun's surface glowing when hot, yellow-hot is hotter than red-hot but not as hot as white-hot
Indicate whether the statement is true or false
True
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Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If 
= [10 m, 30°] and 
= [25 m, 130°], what is the magnitude of the sum of these two vectors?
A. 20 m
B. 35 m
C. 15 m
D. 25 m
E. 50 m
To increase the current density in a wire of length and diameter D, you can
a. decrease the potential difference between the two ends of the wire. b. increase the potential difference between the two ends of the wire. c. decrease the magnitude of the electric field in the wire. d. heat the wire to a higher temperature. e. combine both (b) and (d).
What was the significance of the end of the era of nucleosynthesis, when the universe was about 5 minutes old?
A) It marks the time at which the expansion of the universe had settled down to its current rate. B) The basic chemical composition of the universe had been determined. C) It marks the time at which the first stars formed. D) The proportions of dark matter and luminous matter had been determined.
If a hydrogen emission line appears at 656.2 nm in the laboratory, what can we say about a cloud of hydrogen gas with this same emission line at 680.2 nm?
A) The location of the emission line has nothing to do with speed. B) It is neither receding nor approaching us. C) It is approaching us. D) It is receding away from us.