After an elastic collision of two balls, the kinetic energies of the two balls are measured to be 12 J and 24 J. What can be said about the kinetic energy of the two balls before the collision?
a. nothing—not enough information is given
b. the balls had the same energies, 12 J and 24 J, respectively
c. the total kinetic energy of the two balls was 36 J
d. none of the above
c
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The time from one new moon to the next is approximately
A) one week. B) two weeks. C) three weeks. D) one month. E) two months.
Which of the following statements best describes the idea behind the Carbon Assimilation Experiment on board the Viking landers?
A) living organisms in the soil should incorporate carbon from atmospheric gases B) radioactive gases should be produced when radioactive nutrients are added to a soil sample C) soil with living organisms in it should contain organic molecules D) living organisms in the soil should give off gases when they metabolize nutrients
A body in a room at 300 K is heated to 3,000 K. The wavelength of the most intense EM radiation emitted by the body at 3,000 K is the wavelength of the most intense EM radiation at 300 K
a. 0.0001 times b. 0.1 times c. the same as d. 10 times e. 10,000 times
The main producer of sediment is
A) mechanical weathering. B) ice wedging. C) chemical Weathering. D) erosion.