When potassium and sulfur react to form potassium sulfide, an ionic compound,
a. each sulfur atom loses two electrons.
b. each sulfur atom loses one electron.
c. each potassium atom loses one electron.
d. each potassium atom loses two electrons.
c
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A 4.00 kg mass is located at (2.00 m, 2.00 m, 0.00 m) and a 3.00 kg mass is located at (–1 m, 3.00 m, 0.00 m). If this system of masses rotated about the Y-axis perpendicular to the X-Z plane, then the moment of inertia of this system is
A. 40 kg 
B. 32 kg
C. 29 kg
D. 24 kg
E. 19 kg
Spiral arms are clearly visible features of galaxies because most sun-like stars in the disk are found there
a. True b. False Indicate whether the statement is true or false
Which is a statement of Bernoulli's principle?
a. The pressure in a fluid decreases as its velocity decreases. b. The pressure in a fluid decreases as its temperature decreases. c. The pressure in a fluid decreases as its velocity increases. d. The pressure in a fluid decreases as its temperature increases. e. The speed of a fluid increases as its velocity increases.
A silicon monoxide thin film (n = 1.45) of thickness 77.6 nm is applied to a camera lens made of glass (n = 1.55). This will result in a destructive interference for reflected light of what wavelength?
a. 720 nm c. 450 nm b. 558 nm d. 522 nm