Venus is visible to us:
a) only during its new phase.
b) only near sunrise or sunset.
c) only in the summer.
d) only in the winter.
e) only during the several hours around midnight.
Ans: b) only near sunrise or sunset.
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Identify a true statement about the star clusters in the Milky Way
A) Open clusters are widely scattered throughout the Milky Way. B) Globular clusters are widely scattered throughout the Milky Way. C) Open clusters are more common toward the constellation Sagittarius. D) Globular clusters are more common toward the constellation Aquarius.
The speed v of sound waves in a gas can be expressed in terms of the pressure p and the density ? (mass per unit volume) of the gas, as v = apb?c, where a, b, and c, are dimensionless constants. The dimensions of pressure are [M]/[L][T]2
What must be the values of b and c?
An astronaut in a space suit is motionless in outer space. The propulsion unit strapped to her back ejects some gas with a velocity of 40.0 m/s. The astronaut recoils with a velocity of 1.00 m/s. If the mass of the astronaut and space suit after the gas is ejected is 100 kg and the mass of the gas ejected is 2.50 kg, then the total kinetic energy after the ejection of the gas is
A. 2,050 J. B. 3,430 J. C. 4,150 J. D. 5,070 J. E. 6,320 J.
Uranus and Neptune are very similar in size and mass
Indicate whether the statement is true or false