Solar system space is occupied by very small, solid particles that are called ______________
Fill in the blank(s) with correct word
interplanetary dust
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The common element with bright red, blue-green, and violet emission lines is
A) nitrogen. B) helium. C) hydrogen. D) carbon. E) oxygen.
According to the nonlocality principle,
A) two particles can respond to each other instantaneously, no matter how far apart they are. B) each microscopic particle is always spread out over a large region of space. C) nature is inherently uncertain. D) forces such as gravity and the electromagnetic force can be felt even at a distance. E) two particles can always be in contact with each other by electromagnetic waves that travel at light velocity.
Currently, most of the mass of the matter of the universe is believed to consist of:
A) baryonic matter, made up of protons and neutrons. B) tachyonic matter, travelling only faster than the speed of light. C) dark matter not made of protons and neutrons. D) dark energy. E) tiny but very numerous black holes.
A golf ball hits a wall and bounces back at 3/4 the original speed. What part of the original kinetic energy of the ball did it lose in the collision?
a. 1/4 b. 3/8 c. 7/16 d. 9/16 e. 3/4