The gauge pressure of the water in a swimming pool at 10 ft is ____________ the gauge pressure of the water at 5 ft
a. 1/4
b. 1/2
c. equal to
d. 2 times
e. 4 times
D
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A 16 solar mass main sequence star is at a smaller distance than a 1solar mass mainsequence star. Which star appears brighter?
a) cannot tell with the information given b) stars are approximately the same brightness c) the 16 solar mass main sequence star d) depends on the phase of the Moon e) the 1 solar mass main sequence star
Work-Energy Theorem: The horizontal force that an animal exerts on a large fruit it has found is observed and is shown in the graph in the figure. If the fruit was initially sliding on the frictionless ground at 5.5 cm/s when the animal first grabbed it, by how much did the animal change its kinetic energy during this encounter?
A. 12.5 J B. 50 J C. 25 J D. 22 J E. 0 J
The magnitude of the magnetic field 8.0 cm from a straight wire carrying a current of 6.0 A is
A) 1.5 × 10-3 T. B) 1.5 × 10-5 T. C) 3.0 × 10-3 T. D) 3.0 ? × 10-4 T. E) 3.0 × 10-5 T.
The early atmosphere of Earth had much less oxygen than today. How has Earth's oxygen abundance increased over Earth's history?
A. Ultraviolet light breaks up ozone into oxygen. B. Volcanic eruptions release large amounts of oxygen. C. Cometary impacts over Earth's history have contributed oxygen to the atmosphere. D. Plant life generated oxygen through photosynthesis. E. None of these choices are correct.