What element are most white dwarfs primarily made of? Why?
What will be an ideal response?
They consist largely of carbon, for it is the last element made in their low mass cores, where gravitational contraction will not be able to yield the 600 million K temperatures to go beyond carbon to oxygen and still heavier elements.
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Galaxies contain less mass as dark matter than as visible stars
Indicate whether the statement is true or false
The rapid fluctuations of quasars show that the energy emitting portions of these objects must be very small
a. True b. False Indicate whether the statement is true or false
An ordinary glass lens forms an image by ____________ of light
a. reflection b. refraction c. diffraction
Suppose that a ship is accelerating through space in such a way that the passengers are experiencing a constant force (due to the thrust of the ship) equivalent to the total weight of the ship and passengers on Earth
From the point of view of observers on Earth, how does the ship accelerate? A) It has a constant acceleration of 9.8 m/s2, therefore increasing its speed by 9.8 m/s with each passing second. B) At first, it has a nearly constant acceleration of 9.8 m/ s2. But as it approaches the speed of light, its acceleration gradually slows in such a way that it never stops accelerating, but never reaches the speed of light either. C) At first, it has a very large acceleration—much larger than 9.8 m/s2. But when it reaches the speed of light it stops accelerating. D) It has a constant acceleration of 9.8 m/s2 until it reaches a speed of half the speed of light. Then its acceleration suddenly slows so that it can't go much faster.