Which of the following is not a characteristic of clastic sedimentary rock?
A) They are composed of small pieces of weathered rock.
B) They are classified by particle size.
C) They are created by precipitation.
D) They may contain organic matter.
Answer: C
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Captain Ray, on the Galactic Explorer, sets off bright signal lights at the two ends of his spaceship so that they are seen as flashing simultaneously by General Kay, who is watch the ship go by. General Kay concludes that she was next to the midpoint of the ship at the instant when the lights flashed in her reference frame. This can only happen if Captain Ray, at the center of the Galactic Explorer,
A. sees the lights flash simultaneously in his coordinate system. B. sees the bow (front) light flash before the aft (rear) light. C. sees the aft (rear) light flash before the bow(front light. D. can calculate that the light flashes reach General Kay so that the flash from the bow light reaches her before the flash from the aft light. E. can calculate that the light flashes reach General Kay so that the flash from the aft light reaches her before the flash from the bow light.
From a fracture mechanics viewpoint, small-diameter brittle filaments have a higher strength than bulk material does, because the smaller-diameter material has a smaller _________.
Fill in the blank(s) with the appropriate word(s).
A series circuit consists of a 0.55 H inductor with internal resistance 8.0 ohms connected in series with a 4.0-ohm resistor, a switch, and a 12-V battery
(a) When the switch is closed, what is the initial current through the 4.0-ohm resistor? (b) After the switch has been closed, what is the maximum current in the 4.0-ohm resistor?
The tapered shape of the wheel rims that ride on railroad tracks allows opposite wheels to
A) in effect, vary their diameters. B) travel at different linear speeds for the same rotational speed. C) both of these D) none of these