Which of the following statements about parallax is not true?
A) You can demonstrate parallax simply by holding up a finger and looking at it alternately from your left and right eyes.
B) The existence of stellar parallax is direct proof that Earth orbits the Sun.
C) Measurement of stellar parallax allows us to determine distances to nearby stars.
D) Observing stellar parallax requires only a single photograph taken through a powerful telescope.
E) Ancient astronomers were unable to detect stellar parallax and used the absence of observed parallax as an argument in favor of an Earth-centered universe.
D) Observing stellar parallax requires only a single photograph taken through a powerful telescope.
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A heat engine has an efficiency of 35.0% and receives 150 J of heat per cycle. (A) How much work does it do in each cycle? (B) How much heat does it "waste" in each cycle?
What will be an ideal response?
Two factors that greatly affect air resistance on falling objects are frontal area and
A) mass. B) weight. C) speed.
A Carnot cycle engine operates between a low temperature reservoir at 20°C and a high temperature reservoir at 800°C. If the engine is required to output 20.0 kJ of work per cycle,
how much heat must the high temperature reservoir transfer to the engine during each cycle? A) 27.5 kJ B) 73.2 kJ C) 39.2 kJ D) 800 kJ E) 20.5 kJ
An atom which has 4 protons and 6 neutrons will be electrically neutral if it contains
A) 4 electrons. B) 6 electrons. C) 10 electrons. D) at least 1 electron.