One observation supporting the idea of a spherical Earth is that ________.
A. a traveler moving south will see stars they could not previously see
B. a ship moving away from the observer will move such that the hull is not seen, then the sails
C. the shape of Earth's shadow on the Moon during an eclipse is circular
D. All of these choices are correct.
Answer: D
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What is the source of Jupiter's excess energy?
A) Helium rain falling through its interior B) The decay of radioactive elements in its dense core C) Nuclear fusion in its hot, sunlike core of hydrogen D) The slow escape of gravitational energy released during the planet's formation E) The tidal stresses of the large Galilean moons
A refracting astronomical telescope has objective and eyepiece lenses of focal lengths 38 cm and 0.40 cm, respectively. What is the angular magnification of this instrument?
a. 95 c. 27 b. 50 d. 19.6
The Carboniferous period is well noted for the
A) emergence of the insect. B) evolution of the amniotic egg. C) age of the reptiles. D) extinction of shallow water organisms.
Adiabatic Processes: A monatomic ideal gas at an initial temperature of 390 K is compressed adiabatically from an initial volume of 120 L to a final volume of 40.0 L. What is the final temperature of the gas?
A. 124 K B. 811 K C. 610 K D. 775 K E. 820 K