Where do we find our Sun on the H-R diagram?
A) near the middle of the main sequence
B) at the far upper left of the main sequence
C) with the red giants
D) at the far lower right of the main sequence
E) with the white dwarfs
A) near the middle of the main sequence
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A reading of a tire gauge tells you that the gauge pressure in a tire is 31 lb/in2 . What is the absolute pressure in the tire? Assume that atmospheric pressure is 14 lb/in2
a. 17 lb/in2 b. 59 lb/in2 c. 45 lb/in2 d. You can't be sure since you may have nitrogen-filled tires.
If you toss a coin straight upward while in a train moving at constant velocity, the coin will land
A) as if you were at rest. B) in front of you. C) in back of you.
An ideal gas is allowed to expand adiabatically. Assume the process is reversible. What is the change in entropy?
a. 0 b. nR ln (V2/V1) c. nR ln (T2/T1) d. kn ln (V2/V1) e. kn ln (T2/T1)
A star cluster with a lot of hot, blue stars must be relatively young
Indicate whether the statement is true or false