To use 100 Calories of energy, how high would an 80.0 kg person have to climb?
A. 104 m
B. 298 m
C. 323 m
D. 486 m
E. 534 m
E. 534 m
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What causes stars to twinkle?
A) Stars constantly vary in brightness as they expand and contract. B) Interstellar gas along the line of sight to the star absorbs different amounts of radiation. C) The human eye has difficulty seeing faint objects. D) Moving gases in Earth's atmosphere randomly bend light rays from stars.
You are interviewing a researcher. She states that she does not publish her data from experiments because she does not trust other scientists. How would you respond? (Hint: think about one of the main steps of the scientific method)
What will be an ideal response?
Why does the Sun emit neutrinos?
A) Convection releases neutrinos, which random walk through the radiation zone. B) The Sun does not emit neutrinos. C) Neutrinos are a by-product of fusion in the Sun's core. D) Solar flares create neutrinos with magnetic fields.
A photovoltaic cell receives energy input by
A) conduction. B) convection. C) radiation. D) all of the above