The hydrogen lines of spectral type A main sequence stars are ____
a. the strongest
b. the weakest
c. the most narrow
d. useful in determining apparent magnitude
e. used to estimate the luminosity of the star
a
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An object attached to one end of a string moves in a circle at constant speed. Which of the following is correct?
A. the object is accelerating as it moves B. the object's velocity is the same as its speed C. the object does not require a force to keep its state of circular motion D. if the string breaks, the object will keep its circular motion E. If the string breaks, the object will move Radially away from the center of the cicl
Coronal holes are cooler parts of the corona from which the solar wind escapes.
Answer the following statement true (T) or false (F)
Electromagnetism unites
A) electricity and magnetism. B) electric and gravitational fields. C) physics and biophysics. D) all of the above E) none of the above
An object moving in a circle undergoes
a. constant acceleration b. free fall c. centripetal acceleration d. linear acceleration e. frequency