How does the diameter of the disk of the Milky Way Galaxy compare to its thickness?
A) The diameter is about 100 times as great as the thickness.
B) The diameter and thickness are roughly equal.
C) The diameter is about 10 times as great as the thickness.
D) The diameter is about 100,000 times as great as the thickness.
A) The diameter is about 100 times as great as the thickness.
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Mars has a sufficient mass and a low enough temperature that water molecules could exist in its atmosphere as vapor. One reason Mars' atmosphere does not contain a significant amount of water vapor is that
a. Mars formed in a part of the solar nebula that lacked oxygen. b. Mars formed in a part of the solar nebula that lacked hydrogen. c. All of the water vapor was released in the impact that formed Deimos. d. Ultraviolet radiation breaks the water molecule into less massive particles that can escape. e. The water molecule combines readily with chlorine to form hydrochloric acid.
A pair of air pucks on an air table are set in motion when a compressed spring between them is released. If one puck moves with twice the speed of the other, then its mass is
A) half the mass of the other. B) the same mass as the other. C) twice the mass as the other. D) need more information
Galileo's observations of sunspots proved the Sun was rotating, like the Earth
Indicate whether the statement is true or false
An airplane is flying with constant speed of 300 m/s along a horizontal circle with a radius of 15,000 m. If the lift force of the air on the wings is perpendicular to the wings, at what angle relative to the horizontal should the wings be banked?
A) 15.1° B) 22.2° C) 31.5° D) 37.7° E) 63.0°