The buoyant force of the atmosphere on a body is equal to the
A) weight of air displaced.
B) volume of air displaced.
C) mass of the air displaced.
D) all of the above
E) none of the above
Answer: A
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Two balls are thrown off a building with the same speed, one straight up and one at a 45° angle. Which statement is true if air resistance can be ignored?
(a) Both hit the ground at the same time. (b) Both hit the ground with the same speed. (c) The one thrown at an angle hits the ground with a lower speed. (d) The one thrown at an angle hits the ground with a higher speed. (e) Both (a) and (b).
An airplane flies between two points on the ground that are 500 km apart. The destination is directly north of the origination of the flight
The plane flies with an air speed of 120 m/s. If a constant wind blows at 10.0 m/s due west during the flight, what direction must the plane fly relative to north to arrive at the destination? A) 4.78° east of north B) 4.76° east of north C) 85.2° west of north D) 4.78° west of north E) 4.76° west of north
Which of the following statements about large-scale structure is probably not true?
A) Galaxies and clusters have grown around tiny density enhancements that were present in the early universe. B) Voids between superclusters began their existence as regions in the universe with a slightly lower density than the rest of the universe. C) Many cluster and superclusters are still in the process of formation as their gravity gradually pulls in new members. D) Clusters and superclusters appear to be randomly scattered about the universe, like dots sprinkled randomly on a wall.
Except for the clear link between smoking and lung cancer, most chronic diseases cannot be attributed to a single cause.
a. true b. false