A small hole is cut in the bottom of a water storage tank. The initial depth of the water is 8.00 m. If the diameter of the small hole in the bottom of the tank is 1.00 cm, then what is the flow rate of the water leaving the tank?
a. 
b. 
c. 
d. 
e. 
a.
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Is space expanding within clusters of galaxies?
A) No, because the universe is not old enough yet for these objects to have begun their expansion. B) No, because expansion of the universe affects only empty space, not space in which matter is present. C) Yes, and that is why clusters tend to grow in size with time. D) No, because their gravity is strong enough to hold them together even while the universe as a whole expands.
The last quarter moon rises tonight about midnight; when will it rise, and what will its phase be tomorrow night?
What will be an ideal response?
A diffraction grating with 4000 lines/cm is illuminated by light from the sun. The solar spectrum is spread out on a white wall across the room. At what angle from the center line does blue light (400 nm) appear? At what angle from the center line does red light (650 nm) appear?
A photon of frequency
Hz has what energy?
A. 1.26 eV B. 1.93 eV C. 2.11 eV D. 2.65 eV E. 3.17 eV