The annual amount of snow lost by a glacier is called
A) accumulation.
B) sublimation.
C) ablation.
D) sustation.
Answer: C
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Parallel light rays from a distant object strike the surface of a concave mirror. After reflecting from the mirror's surface, the rays will converge at
a. the mirror's focal point. b. a point beyond the mirror's focal point. c. a point nearer than the mirror's focal point. d. none of the above.
Comet nuclei typically have an average density of 0.5 g/cm3. This suggests a(n) ________ composition.
A. icy and gaseous B. icy and rocky C. icy and loosely packed D. gaseous and rocky E. gaseous
The potential difference across the terminals of a storage battery not connected in any circuit is observed to be 12 V. When it is connected to an external resistance the potential difference across the terminals is observed to be 11 V while the current in the external resistance is 3 A. What is the internal resistance of the battery?
A. 2.0 ohms B. 0.33 ohm C. 5.5 ohms D. 1.0 ohm E. Zero ohms
A mass hangs from a spring that is fixed to the ceiling. The mass is now pulled down and released so the mass oscillates up and down. Which of the following statements is true?
A. The gravitational force on the mass oscillates at the same frequency as the mass B. The kinetic energy of the oscillating mass is a constant C. Adding mass to the spring will make it oscillate faster D. The restoring force of the spring is equal to the weight of the mass E. None of these choices are true