Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 4r. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit?
A) 20 d
B) 40 d
C) 80 d
D) 160 d
E) 320 d
D
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Weight and g: By how many newtons does the weight of a 100-kg person decrease when he goes from sea level to mountain top at an altitude of 5000 m? The mean radius of the earth is 6.38 × 106 m.
A. 0.60 N B. 1.5 N C. 2.6 N D. 3.6 N E. 9.8 N
A calorie is defined to be the amount of heat required to raise the temperature of
a) 1 pound of water by 1 degree Celsius b) 1 gram of water by 1 degree Celsius c) 1 gram of water by 1 degree Fahrenheit d) 1 pound of water by 1 degree Fahrenheit
The quantity 0.00325 × 10-8 cm is equivalent to
A) 3.25 × 10-12 mm. B) 3.25 × 10-11 mm. C) 3.25 × 10-10 mm. D) 3.25 × 10-9 mm. E) 3.25 × 10-8 mm.
What is meant by the microwave observations of the cosmic background radiation revealing the "genetic code" of the universe?
What will be an ideal response?