What principle was Copernicus unable to provide evidence against?
a. uniform circular motion
b. heliocentric universe
c. geocentric universe
d. retrograde motion
e. Ptolemy's epicycles
a
Physics & Space Science
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Phase Angles: A 50-? resistor is placed in series with a 40-mH inductor. At what frequency will the current in this circuit lag the applied voltage by exactly 45°?
Fill in the blank(s) with the appropriate word(s).
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Cryptosporidiosis was added to the national list of notifiable diseases in 1995 after a widespread outbreak in which American city?
What will be an ideal response?
Physics & Space Science
A(n) ________ spectrum has dark lines on a continuous background.
A. continuous B. emission C. absorption D. None of these choices are correct.
Physics & Space Science
Explain how the age of a star cluster provides evidence of stellar evolution
What will be an ideal response?
Physics & Space Science