The substances that are diminished in a chemical reaction are called the
a. products.
b. reactants.
c. chemicals.
d. precipitates.
b
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The H-R diagram main-sequence of stars has a limit at the lower-mass or energy-output end because
a. low-mass stars form from the interstellar medium very rarely. b. low-mass objects are composed primarily of solids, not gases. c. pressure does not depend on temperature in degenerate matter. d. the lower limit represents when the radius of the star would be zero. e. there is a minimum temperature for hydrogen nuclear fusion (the definition of a star).
What is the nearest huge cluster of thousands of galaxies, to which the Local Group may belong?
A) The Great Wall B) Virgo Cluster C) Sagittarius Cluster D) Corona Borealis Cluster E) Coma Cluster
A conducting rectangular loop of mass M, resistance R, and dimensions a × b is allowed to fall from rest through a uniform magnetic field which is perpendicular to the plane of the loop. The loop accelerates until it reaches a terminal speed (before the upper end enters the magnetic field). If a = 2.0 m, B = 6.0 T, R = 40 ?, and
M = 0.60 kg, what is the terminal speed?
a.
1.6 m/s
b.
20 m/s
c.
2.2 m/s
d.
26 m/s
e.
5.3 m/s
The uncertainty in the position of a proton is 250 pm. What is the minimum kinetic energy of the proton when its position has been measured to this precision?
A. 41 MeV B. 83 MeV C. 21 MeV D. 5.2 MeV