Two sound waves can interfere:
1.only when traveling in the same direction.
2.only when the frequencies are the same.
3.only when both are sinusoidal.
4.only when the phase difference is constant.
5.None of the above.
5
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Which of the following is the reason for the solar day being longer than a sidereal day?
A) precession of Earth's axis B) the tilt of Earth's axis C) the combined effect of the rotation of Earth and its orbit about the Sun D) Earth year being a non-integer number of Earth days E) the non-circular orbit of Earth around the Sun
Mars currently lacks surface habitability mostly because of
A) the chemical composition of its atmosphere B) its distance from the Sun C) its small size D) the chemical composition of its surface
A book rests on a table, and the table rests on the ground. Which of the following pairs of forces forms a force pair, or action-reaction pair, obeying Newton's law of force pairs?
A) Gravity pulling down on the table and the book pushing down on the table. B) The ground pushing up on the table and the book pushing down on the table. C) The table pushing up on the book and the book pushing down on the table. D) Gravity pulling down on the book and the book pushing down on the table. E) Gravity pulling down on the book and the table pushing up on the book.
Why do Terrestrial planets not have rings? a. Terrestrial planets rotate in the opposite direction of the Sun
b. Terrestrial planets do not have large enough masses to retain particles in rings. c. Terrestrial planets have a core too rich in heavy metals to retain rings. d. Terrestrial planets are too close to the Sun to support a ring system. e. Terrestrial planets are not gaseous bodies.