Star X has an apparent magnitude of 3, and star Y has an apparent magnitude of 8. How do they compare in observed brightness?
A) Star X is 100 times brighter than star Y. B) Star X is 5 times brighter than star Y.
C) Star Y is 100 times brighter than star X. D) Star Y is 5 times brighter than star X.
A
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Fundamental Forces: Inside the nucleus, the strongest of the four fundamental forces is
A. the weak nuclear force. B. the electromagnetic force. C. the gravitational force. D. the strong nuclear force.
A heat engine operating between 40°C and 380°C has an efficiency 60% of that of a Carnot engine operating between the same temperatures. If the engine absorbs heat at a rate of 60 kW, at what rate does it exhaust heat?
What will be an ideal response?
How do we know Earth has a liquid core?
A. P waves pass through it, but S waves do not. B. Both S and P waves pass through it. C. Because we have used X-rays to probe it. D. S waves pass through it, but P waves do not.
Compared to a cluster containing type O and B stars, a cluster with only type F and cooler stars will be:
A) younger. B) older. C) further away. D) more obscured by dust. E) less obscured by dust.