The speed of sound through the ground is about 6.0 km/s while the speed of sound in air is 343 m/s. A very powerful explosion occurs some distance away and you feel the ground vibrate 60 seconds before you hear the sound of the explosion
How far away is the explosion? A) 20 km
B) 22 km
C) 25 km
D) 27 km
E) 30 km
B
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Why are galaxies in the blue cloud blue?
A) They contain hot, young stars that signify active star formation. B) They are moving slower than stars in the red cloud. C) They contain lots of dust that cause the bluish color. D) They contain cold, dying stars that are fading to black.
A beam of light travels a distance of 2900 m. How much time does it take?
A) 9.7 s B) 9.7 ms C) 9.7 ?s D) 9.7 ns E) 9.7 ps
Nearsightedness is usually corrected with
A) converging lenses. B) diverging lenses. C) convex mirrors. D) cylindrical lenses. E) concave mirrors.
Five children are pushing on a snowball; each is pushing with a force of 10.0 N. Each is pushing at an angle of 45
relative to his neighbor. What is the net push on the ball?
A. 0 N B. 24.1 N C. 27.1 N D. 17 N E. 50 N