Incompressible water flows out of a large reservoir through a pipe that opens to the atmosphere 5.70 m below the level of the water in the reservoir. What is the speed of the water as it comes out of the pipe?
A) 1.72 m/s
B) 7.47 m/s
C) 55.8 m/s
D) 10.6 m/s
E) 27.9 m/s
D
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Galaxies seem to be made mostly of dark matter. One type of evidence for this comes from observations of the
A) energy emitted by distant quasars, which is far larger than can be explained by the visible matter in the quasars. B) gravitational bending of light from distant galaxies as it passes other galaxies on its way to Earth. C) redshift in the light from the earliest galaxies in the universe. D) force of gravity acting on laboratory objects. E) redshift in the light from the explosions of distant supernovas.
The least diffraction occurs for
a. ? < d. b. ? = d. c. ? > d. d. none of these; that is, it makes no difference.
The use of fiberglass insulation in the outer walls of a building is intended to minimize heat transfer through the wall by what process?
a. conduction c. convection b. radiation d. vaporization
If two bicyclists move around a circular track of radius 100 m, at the same speed, 10 m/s, but in opposite directions, then
A. they have equal size accelerations, 1 m/s2. B. they might have different accelerations, depending on whether they have identical mass or not. C. they have opposite accelerations, +1 m/s2 (inward) and -1 m/s2 (outward). D. one has centripetal acceleration of 1 m/s2 and the other has centrifugal acceleration of 1 m/s2.