A jet plane travels around the world at 2000 mi/hr (894 m/s). Two accurate atomic clocks measure the times of flight, one on board the plane and the second on Earth. If it takes 12 hours to complete the journey, what will the time difference (in ?s) be?
A. 0.75
B. 0.50
C. 0.25
D. 1.0
E. 0.19
Answer: E
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A 100-g sample of a certain substance undergoes a transformation of some kind that releases 20,000 J of energy. What kind of transformation is this likely to be?
A. A temperature change B. A phase change C. A chemical reaction D. A nuclear reaction E. It is impossible to guess.
Briefly explain why Mercury, Venus, and the Moon do not have significant erosion. Relate erosional activity to planetary size and distance from the Sun
What will be an ideal response?
On a cold day, a heat pump absorbs heat from the outside air at 14°F (?10°C) and transfers it into a home at a temperature of 86°F (30°C). Determine the maximum COP of the heat pump
a. 0.2 b. 4.4 c. 0.5 d. 7.6 e. 6.7
The scientific method is most effective in
A) making hypotheses. B) gaining, organizing, and applying new knowledge. C) discovering new things. D) making theories. E) performing experiments.