In what way is the formation of a galaxy from a cloud the opposite of stellar formation?
What will be an ideal response?
In stellar formation, the cloud breaks up into smaller and smaller segments. In galactic formation, the cloud builds into larger and larger segments.
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A Doppler weather radar operates at a frequency of 3.40 GHz. The wave from this radar system reflects from an approaching weather system moving with a speed of 39.0 m/s. What is the difference in frequency between the outgoing and returning waves?
A) 442 Hz B) 351 Hz C) 419 Hz D) 322 Hz E) 670 Hz
A wave is described by y = 10 sin (4.0pt – 6.0px). If the equation is in SI units with the units suppressed, what is its frequency?
a. 6.0 Hz c. 3.0 Hz b. 2/3 Hz d. 2.0 Hz
Which stars have convective cores?
A) low-mass stars B) intermediate-mass stars C) high-mass stars D) all of the above E) none of the above
What charge accumulates on the plates of a 2.0-?F air-filled capacitor when it is charged until the potential difference across its plates is 100 V?
A) 50 ?C B) 100 ?C C) 150 ?C D) 200 ?C