The symbol for potassium is
a. Pm.
b. Po.
c. P.
d. K.
d
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If an object is located 20 m to the right of the origin at 1:00 PM, and later the object is located 30 m to the right of the origin at 2:00 PM, then the displacement from 1:00 PM to 2:00 PM is
A. 50 m to the right. B. 30 m to the right. C. 25 m to the right. D. 20 m to the right. E. 10 m to the right.
Displacement is
A. the distance traveled from the first position to the final position. B. the distance from the origin to the final position. C. the change of the position vector from the first position the final position. D. the vector from the origin to the final position.
For what type of object is the period-luminosity relation used for determining distances?
A) RR Lyrae variables B) T Tauri variables C) Cepheids D) Cataclysmic variables E) Planetary nebulae
The fact that one side of the Moon always faces Earth is evidence that while revolving about the Earth it
A) does not rotate about its axis. B) rotates about its axis.