The angular size of the Sun as observed from Earth is about 0.5 degree.
Answer the following statement true (T) or false (F)
True
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A 0.30-kg object is oscillating on a spring with a spring constant of k = 22.0 N/m. What is the potential energy of the system when the object displacement is 0.035 m, exactly half the maximum amplitude?
a. zero b. 0.027 J c. 0.013 J d. 0.39 J e. 11 J
A steel piano string is attached, under tension, at each end to secure posts. When gently struck, a faint note can be detected coming from the string. The string is then cooled by blowing cold air over it and then is struck again. How does the note now detected compare to the previous one
a. It is the same since the posts don't move. b. It is at a higher frequency than the original one. c. It is at a lower frequency than the original one. d. More than one answer is correct.
The ability of a telescope to show two very close objects separately is called its ________.
A. focal length B. light-gathering power C. resolving power D. magnification
Why do white dwarfs have high temperatures?
A. chemical reactions on their surfaces B. heat left over from their formation C. nuclear fusion in their cores D. frictional heating from motions inside the white dwarfs