White dwarfs are so called because
A) they are both very hot and very small.
B) they are the end-products of small, low-mass stars.
C) they are the opposite of black holes.
D) it amplifies the contrast with red giants.
E) they are supported by electron degeneracy pressure.
A
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The planet Mars reaches its closest point to the Earth approximately every
A) 26 months B) 12 months C) 6 months D) 36 months
Uniform Circular Motion: A car moving at a steady 10 m/s on a level highway encounters a depression that has a circular cross-section with a radius of 30 m. The car maintains its speed as it drives through the depression. What is the normal force exerted by the seat of the car on a 60.0-kg passenger when the car is at the bottom of the depression?
A. 200 N B. 390 N C. 790 N D. 490 N E. 590 N
Rays that pass through a lens very close to the lens axis are more sharply focused than those that are very far from the axis. The inability of a lens to sharply focus off-axis rays is called spherical aberration
This effect helps us to understand why A) we become more farsighted as we grow older. B) we become more nearsighted as we grow older. C) we can see only in black and white in dim light. D) it is easier to read in bright light than in dim light. E) a moving object is more readily detected than a stationary one.
A hockey puck slides off the edge of a table with an initial velocity of 28.0 m/s. and experiences no air resistance
The height of the tabletop above the ground is 2.00 m. What is the angle below the horizontal of the velocity of the puck just before it hits the ground? A) 77.2° B) 72.6° C) 12.8° D) 12.6° E) 31.8°