Why would spiral galaxies be less common now than in the early universe?
What will be an ideal response?
As galaxies collide they change. As large spiral galaxies collide, they merge into ellipticals. Over time, more and more collisions between large spirals reduce their overall number.
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Which of the following best describes the lunar maria?
A) densely cratered regions on the Moon B) mountainous regions on the Moon C) frozen oceans of liquid water on the Moon D) relatively smooth, flat plains on the Moon
What do we mean by dimension in the context of relativity?
A) the number of independent directions in which movement is possible B) the size of an object C) the number of sides that we can see when we look at an object D) the letter used to represent length mathematically
A starburst galaxy is a galaxy that:
A) is undergoing a rapid surge of white dwarf explosions. B) is undergoing a rapid surge of star formation. C) has never interacted with another galaxy. D) is undergoing a rapid burst of supernovae explosions.
A block lies on a smooth inclined plane tilted at an angle of 35° to the horizontal
(a) Draw the free-body diagram for the block. (b) Determine the block's acceleration as it slides down the inclined plane. (c) If the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline. (d) How long did it take the block to reach the bottom of the inclined plane?