Describe ferromagnetism
What will be an ideal response?
A ferromagnetic material produces a magnetic field even in the absence of an external magnetic field. Permanet magnets are constructed of ferromagnetic materials.
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The critical fiber length divided by the fiber _________is equal to the critical aspect ratio.
Fill in the blank(s) with the appropriate word(s).
____ have elongated nuclei with spiral structure extending from the ends of the elongations. The Milky Way is a member of this class of galaxy
a. Spiral galaxies b. Barred spiral galaxies c. Elliptical galaxies d. Irregular galaxies e. S0 galaxies
Based on fundamental laws of motion and gravity, which of the following best explains why Kepler's second law (planets move faster in the parts of their orbit that are closer to the Sun and slower when they are farther from the Sun) is true?
A) A planet's angular momentum must be conserved as it moves around its orbit. B) The speed of a planet at any point in its orbit depends on its temperature, which varies with distance from the Sun. C) The strength of gravity is inversely proportional to the square of the distance between two objects. D) The gravitational influence of other planets determines the speed of any particular planet's orbit.
Which of the following alternatives to water has a wider temperature range over which it is a liquid?
A) ammonia B) methanol C) methane D) ethane