Near the earth the intensity of radiation from the sun is 1.35 kW/m2
What volume of space in this region contains 1.0 J of electromagnetic energy? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 4.5 x 10-6 m3
B) 3300 m3
C) 7.4 x 10-4 m3
D) 1400 m3
E) 220,000 m3
E
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An object can remain balanced if
A. Its mass is equally distributed B. Its center of gravity is to the right of the pivot points C. Its center of gravity is to the left of the pivot point D. Its center of gravity is over the pivot point
How do most of the heavier elements up to iron form in the universe?
A. by nucleosynthesis in the cores of massive stars B. in supernova explosions C. in the cores of protostars D. in the original interstellar clouds
A ball is thrown upwards and returns to the same location. Compared with its initial speed its speed when it returns is about
A) half as much. B) the same. C) twice as much. D) four times as much.
Some stars vary in brightness. What observing technique is best for observing the details of the changes in brightness?
A) Time-monitoring because we want to track how the brightness changes with time. B) Imaging because an image will show the star getting brighter and dimmer. C) Spectroscopy because changing brightness means changing temperature. D) All of the above are equally useful in detecting variation in brightness.