The process of photosynthesis is important because it
A) converts carbon and water to hydrocarbon and free oxygen.
B) contributed to the development of an ozone layer.
C) is an energy source that drives the geologic process.
D) allowed increased infiltration of solar energy.
Answer: B
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Two small objects, with masses m and M, are originally a distance r apart, and the gravitational force on each one has magnitude F. The second object has its mass changed to 2M, and the distance is changed to r/4
What is the magnitude of the new gravitational force? A) F/32 B) F/16 C) 16F D) 32F E) 2F
When a Hooke's law spring is stretched a distance 3x, how much is the increase in energy stored in it from when it was stretched a distance x? Give your answer in terms of a multiple of the energy stored in the spring when it is stretched a distance x
a. It is 3 times as much. b. It is 8 times as much. c. It is 4 times as much. d. It is 9 times as much.
Which of the following is a strong acid?
a. Citric acid b. Nitric acid c. Phosphoric acid d. Acetic acid
If a 2.0-MeV neutron released in a fission reaction loses half its kinetic energy in each moderator collision, how many collisions are needed to reduce its kinetic energy to 1/25 eV?
A) 6 B) 18 C) 26 D) 30 E) 4