The basic force that binds materials together is:
a. gravitational force.
b. nuclear force.
c. buoyant force.
d. inertial force.
e. electrical attraction.
e
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Which is the latest stage (of those given below) in the evolution of a star?
A) red giant B) white dwarf C) protostar D) geodesic E) supernova
What is a void?
A. a part of the sky that astronomers cannot observe due to bright emission from interstellar dust B. another name for a dark nebula C. a part of the sky where no galaxies are visible to us because of obscuring dust in the milky way D. a region in the universe where there are almost no galaxies
Globular cluster stars are ________ in heavy elements than those in open clusters
Fill in the blank(s) with correct word
A particle is moving with a certain speed. Its speed and momentum are being measured with respect to Earth. When the particle's speed doubles, the momentum increases by a factor of 4. What was the original speed of the particle?
A) 0.447c B) 0.488c C) 0.523c D) 0.648c E) 0.800c