The nuclear bulge of our galaxy
a. contains stars that are primarily population I stars.
b. is primarily composed of gas and dust.
c. contains stars primarily associated with the spherical component of our galaxy.
d. contains stars primarily associated with the disk component of our galaxy.
e. a, b and d
C
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Scientists have detected mergers of black holes that have spiraled into each other by
A) detecting gravitational waves from the merger. B) observing distant systems that produce unusually strong gamma-ray emission. C) observing distant systems that produce unusually strong radio emission. D) detecting rapidly pulsating sources of gamma-ray emission.
A big defensive lineman picks up a fumbled football and begins rumbling toward the end zone. His mass is 150 kg, and his velocity is 6.0 m/s, west. A brave wide receiver, whose mass is 90 kg, must stop that lineman and he is right in the lineman's path, so it has to be a head-on collision. How fast must the wide receiver be running if he wants to drop the lineman in his tracks and save the day?
A. 88 mph B. 10 m/s C. 0.60 m/s D. 8.3 m/s
The numbers in front of the formulas in a chemical
equation are referred to as a) subscripts. b) superscripts. c) coefficients. d) common denominators.
The weak force that acts between an electron and a quark is caused by the exchange of:
a. photons. c. gravitons. b. W+, W–, or Z0 bosons. d. gluons.