What evidence supports the predicted existence of gravitational waves?
A) The orbit of a star system consisting of two neutron stars is slowly decaying, suggesting that energy is being carried away by gravitational waves.
B) The energy generated by gravitational waves from the Sun can be seen as it is absorbed by Jupiter.
C) Gravitational waves are frequently and easily detected by large telescopes.
D) Photographs of spacetime show the gravitational waves as ripples that are clearly visible.
A
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Fluid Flow: Water flows out of a large reservoir through 5.0-cm diameter pipe. The pipe connects to a 3.0-cm diameter pipe that is open to the atmosphere, as shown in the figure. What is the speed of the water in the 5.0-cm pipe? Treat the water as an ideal incompressible fluid.
A. 2.3 m/s B. 3.2 m/s C. 3.9 m/s D. 8.9 m/s E. 10 m/s
An object is in front of a concave spherical mirror, and its image is 4.0 cm behind the mirror. If the focal length of the mirror has a magnitude of 5.0 cm, where is the object?
A) 2.2 cm in front of the mirror B) 2.2 cm behind the mirror C) 9.0 cm in front of the mirror D) 1.0 cm behind the mirror
Suppose you look at a detailed spectrum of visible light from some object. How can you decide whether it is an emission line spectrum or an absorption line spectrum?
A) An emission line spectrum consists of bright lines on a dark background, whereas an absorption line spectrum consists of dark lines on a rainbow background. B) An emission line spectrum consists of a long bright line, whereas an absorption line spectrum consists of a long dark line. C) The only way to decide is to make a graph of the intensity of the light at every wavelength, and then analyze the graph carefully. D) The emission line spectrum is produced by electrons jumping up in energy level, whereas the absorption line spectrum is produced by electrons jumping down in energy level.
If the Sun rises precisely due east and you don't live on the equator..
a) You must be located at Earth's north pole.
b) You must be located at Earth's South pole.
c) It must be the day of the summer solstice.
d) It must be the day of either the spring or fall equinox.
e) It must be the day of the winter solstice