A hose has been clamped so that the area at the clamp is only one quarter the area of the rest of the hose. When we ignore the viscosity of water, the ratio of the volume of water delivered per unit time when the clamp is on to the volume of water delivered per unit time without the clamp is
A.
.B.
.C.
.D.
.E.
Answer: E
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Scientists have confirmed that the particles of Saturn's rings are not ____
a. held by Saturn's moons b. within the Roche limit c. chunks of ice d. ancient e. primordial
A car traveling at 3.0 m/s has a constant acceleration of 4.0 m/s2 . After 2.0 seconds, the velocity is
A. 5.0 m/s. B. 7.0 m/s. C. 9.0 m/s. D. 11 m/s. E. 13 m/s.
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 increased,
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.
Might a region of intergalactic [between the galaxies] space, containing no material particles, contain energy?
A) No, because only material particles can possess energy. B) No, because physically nothing exists except particles and empty space. C) No, for both of the above reasons. D) Yes, it might contain the thermal energy of intergalactic gases. E) Yes, in the form of electromagnetic fields and other force fields.