The water level in a reservoir is maintained at a constant level. What is the exit velocity in an outlet pipe 3.0 m below the water surface?
a. 2.4 m/s
b. 3.0 m/s
c. 5.4 m/s
d. 7.7 m/s
e. 49 m/s
d
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The Moon is gravitationally attracted to Earth. Is Earth gravitationally attracted to the Moon?
A. No, the Moon has no gravity. B. Yes, but the force of attraction is less. C. Yes, and the force of attraction is the same. D. Yes, but the force of attraction is greater.
When a single slit that is 0.050 mm wide is illuminated by light of 550-nm wavelength, what is the angular separation between the first two minima on one side of the central maximum?
A) 0.36° B) 0.47° C) 0.54° D) 0.63° E) 1.3°
The separation of white light into its component
colors is called a) dispersion. b) polarization. c) diffraction. d) refraction.
EMF's from electrical lines ________
a. drop off with the distance squared from the line b. are only an influence for high voltages c. have been positively shown to cause cancer in children d. are not important inside houses.