Which of the following is a necessary condition for an ice mass to be a glacier?
A) Accumulation must exceed ablation.
B) Basal sliding must occur.
C) The ice mass must move under its own weight.
D) Meltwater must be present.
Answer: C
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Given the observed average distance between galaxies today, which statement is true?
A) The faster the past expansion rate, the younger the age of the universe. B) The faster the past expansion rate, the older the age of the universe. C) The age of the universe depends only on the average distance between galaxies, not on the rate of expansion.
At time C, is the expansion of the universe accelerating, coasting, or decelerating?
What will be an ideal response?
A 3.0-kg mass sliding on a frictionless surface has a velocity of 5.0 m/s east when it undergoes a one-dimensional inelastic collision with a 2.0-kg mass that has an initial velocity of 2.0 m/s west. After the collision the 3.0-kg mass has a velocity of 1.0 m/s east. How much kinetic energy does the two-mass system lose during the collision?
A. 22 J B. 24 J C. 26 J D. 20 J E. 28 J
What is the oxidant?
In one type of fuel cell, the following oxidation-reduction reactions are taking place: 2 H2 + O2 ? 2 H2O A) H2 B) O2 C) H2O D) all of the above E) none of the above