The position x, in meters, of an object is given by the equation x = A + Bt + Ct2, where t represents time in seconds. What are the SI units of A, B, and C?
A) m, s, s2
B) m/s, m/s2, m/s3
C) m, s, s
D) m, m, m
E) m, m/s, m/s2
D
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Which of the following statements is true of giant stars?
A) Supergiant stars are 1000 times smaller than the Sun's diameter. B) They have more surface area than main-sequence stars of the same temperature. C) They have very low luminosities because of their big size. D) Red dwarfs are giant stars that are hot and have high luminosities.
The reaction energy associated with a nuclear reaction is
a. the total change in rest energy as a result of the reaction. b. equivalent to the disintegration energy. c. the minimum energy necessary for such a reaction to occur. d. called the threshold energy. e. the binding energy of the nucleons.
In the context of a redshift and a blueshift, "red" and "blue" refer to the actual color of the light
Indicate whether the statement is true or false
Which radiation is the most useful to map the structure of our Galaxy?
A. 21-cm radio radiation B. X-rays C. gamma rays D. far ultraviolet