Velocity: A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, and then 1.0 km north to return to its starting point. This trip takes 45 min. What was the bear's average velocity?
A. 0.00 km/h
B. 0.067 km/h
C. 4.0 km/h
D. 5.3 km/h
Answer: A
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Which is the correct order of planetary object class during their formation?
a. planetesimals, protoplanets, and planets b. planets, planetesimals, and protoplanets c. planetesimals, planets, and planetettes d. protoplanets, planetesimals, and planets e. planetesimals, planetettes, and planets
Careful observations of the sky by ancient cultures served the practical purpose of
A) keeping track of time B) improving night vision C) religious worship D) keeping track of the changing position of the Earth around the Sun
A mass m = 2.0 kg is attached to a spring having a force constant k = 290 N/m as in the figure. The mass is displaced from its equilibrium position and released. Its frequency of oscillation (in Hz) is approximately
?
?
A. 12. B. 0.50. C. 0.010. D. 1.9. E. 0.080.
The most harmful radiations are those that
A) kill living cells. B) damage living cells. C) don't encounter cells.