If the north poles of two bar magnets are brought close to each other, the magnets will
A)
attract.
B)
repel.
B
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Aristotle's hypothesis was that:
A) lunar eclipses were created by our shadow. B) only a spherical Earth would always cast a circular shadow on the Moon. C) lunar eclipses would have to happen every full moon. D) the Sun lay at the center of the planet orbits. E) the Moon orbited the Earth.
In the gas laws, the ______________ temperature scale must be used
Fill in the blank(s) with correct word
What is meant by the "normal" to a surface?
a. a line perpendicular to the surface at a given point b. the angle between the surface and the light ray c. a line parallel to the surface at a given point d. the direction of a reflected ray
Terrestrial radiation is
A) emitted by Earth. B) emitted by the Sun. C) both of these D) neither of these