Identify the TRUE statement.
The composition of the Jovian planets is mainly gas and "ice."
The terrestrial planets consist mainly of "ice."
The Sun accounts for almost 50% of the Solar System's mass.
The only two planets with moons are Earth and Jupiter.
Our Sun is the only star we know of that has planets associated with it.
The composition of the Jovian planets is mainly gas and "ice."
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Why does the plasma tail of a comet always point away from the Sun?
A) It is allergic to sunlight. B) Gases from the comet, heated by the Sun, push the tail away from the Sun. C) Radiation pressure from the Sun's light pushes the ions away. D) The conservation of the angular momentum of the tail keeps it always pointing away from the Sun. E) The solar wind blows the plasma ions directly away from the Sun.
One way in which the ionizing radiation occurring naturally in the environment has been beneficial to the human race is
A) the application of solar radiation to the treatment of cancer. B) in the operation of the electron microscope. C) in making nuclear fission possible. D) in producing the mutations that are essential for the process of evolution. E) nonsense--there are no beneficial uses of naturally-occurring high-energy radiation.
The Tonga Trench in the Pacific Ocean is 36,000 feet deep. Assuming that sea water has an average density of 1.04 g/cm3, calculate the absolute pressure at the bottom of the trench in atmospheres
A) 1.1 × 103 atm B) 1.1 × 108 atm C) 1.1 × 105 atm D) 1.1 × 106 atm E) 2.1 atm
The brightest object in the sky is
a. the Sun. b. the Moon. c. Venus. d. Mars.