The extraordinary blueness in lakes in the Canadian Rockies is the result of
A) high-altitude refraction of light.
B) glacial silt in the water scattering blue light.
C) the unique temperatures of these lakes throughout most of the year.
D) none of the above
Answer: B
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The resultant of a 40-N force at right angles to a 30-N force is
A) 30 N. B) 40 N. C) 50 N. D) greater than 50 N.
A bicycle that travels twice as fast as another when braking to a stop will skid
A) twice as far. B) four times as far. C) eight times as far D) sixteen times as far. E) depends on the bike's mass
A model rocket sits on the launch pad until its fuel is ignited, blasting the rocket upward. During the short time of blast-off, as the ignited fuel goes down, the rocket goes up because:
a. the fuel pushes on the ground. b. air friction pushes on the escaping fuel. c. the downward force of gravity is less than the downward momentum of the fuel. d. of none of the above reasons.
For a healthy adult, the largest percentage of daily water output is attributed to
a. feces. b. lung respiration. c. urine. d. perspiration.