The distance a freely falling object falls from rest in one-half second is
A) 2 m.
B) 4 m.
C) 6 m.
D) none of the above
Answer: D
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A reflection nebula is caused by:
A) starlight reflected off of a surface. B) sunlight reflected off of a surface. C) sunlight scattered by dust particles. D) starlight scattered by dust particles. E) emission by ionized gas.
A 3.50-g bullet, traveling at 250 m/s, hits a hinged, light board at right angles, at a distance of 55.0 cm from its hinges, and emerges on the other side of the board with a speed of 150 m/s
The board is initially stationary but is free to rotate about its hinges and has a moment of inertia of 0.275 kg?m2. What is the angular speed of the board after the bullet emerges? A) 0.700 rad/s B) 3.05 rad/s C) 6.10 rad/s D) 0.0212 rad/s E) 22.6 rad/s
Why are there no black dwarfs yet, but in the future they may make up the majority of normal matter in the universe?
What will be an ideal response?
Dark dust clouds are optically invisible, but give off radio energy
Indicate whether the statement is true or false