A jet of water flowing from a hose at 18 m/s is directed against a wall. If the mass flow in the fluid stream is 2.0 kg/s, what force is the water applying to the wall if backsplash is negligible?
a. 36 N
b. 0.11 N
c. 38 N
d. 350 N
e. 34 N
a
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At which lunar phase(s) are tides least pronounced (e.g., the lowest high tides)?
A) first quarter B) new Moon C) full Moon D) both new and full Moons E) both first and third quarters
When you look at a single-slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the width of the slit is decreased,
A. the pattern shrinks in size (central maximum less wide; other maxima in closer to it). B. the pattern increases in size (central maximum wider; other maxima farther from it). C. it does not affect the size of the pattern. D. the width of the central maximum increases, but the other maxima do not change in position or width. E. the width of the central maximum decreases, but the other maxima do not change in position or width.
Suppose you see a photo showing Jupiter half in sunlight and half in shadow (that is, a first quarter Jupiter). This photo might have been taken by ________
A) the Arecibo radio telescope in Puerto Rico B) the Galileo spacecraft that orbited Jupiter in the 1990s C) the Keck telescope on Mauna Kea, Hawaii D) the Hubble Space Telescope (which orbits Earth)
An object is placed at the focal point of a converging lens and the light rays from the lens will be parallel to the principal axis. The object is now moved closer to the lens. Which statement is true about the light rays from the lens?
A. the will remain parallel to the principle axis B. they converge toward each other C. they emerge parallel to each other but not the principle axis D. they diverge from each other