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
C
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The amount of work done on a heavy box carried by Nellie across a room at a constant speed
A) depends on the weight of the box. B) depends on the distance walked. C) depends on both weight of the box and distance walked. D) is none. E) none of the above
Our calendar is based on the length of the tropical year rather than the sidereal year
Indicate whether the statement is true or false
How does a lenticular galaxy differ from a spiral galaxy?
A) It has no bulge. B) It has an elongated bulge resembling a bar more than a sphere. C) It is flatter in shape. D) It has no gas or dust. E) It has no spiral arms.
A 30-?F capacitor is charged to 40 V and then connected across an initially uncharged 20-?F capacitor. What is the final potential difference across the 30-?F capacitor?
a. 15 V b. 24 V c. 18 V d. 21 V e. 40 V