A comet consists of
a. a nucleus only.
b. a coma only.
c. a tail only.
d. all of these.
d
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Simple Harmonic Motion: In simple harmonic motion, when is the magnitude of the acceleration the greatest? (There could be more than one correct choice.)
A. when the speed is a maximum B. when the displacement is a zero C. when the magnitude of the displacement is a maximum D. when the potential energy is a maximum E. when the kinetic energy is a minimum
The ______________ for compounds are written by putting the composing elements' symbols adjacent to each other, with subscripts indicating the number of atoms of each
a. equations b. molecules c. isotopes d. formulas
A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg • m2 is rotating freely with an angular speed of 1.0 rad/s
Two people, each having a mass of 60 kg, are standing right outside the edge of the merry-go-round and step on it with negligible speed. What is the angular speed of the merry-go-round right after the two people have stepped on? A) 0.20 rad/s B) 0.40 rad/s C) 0.60 rad/s D) 0.80 rad/s E) 0.67 rad/s
Two-Source Interference of Sound: Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz. A person is standing away from the wall, in front of one of the loudspeakers. What is the closest nonzero distance from the wall the person can stand and hear constructive interference? The speed of sound in air is 343 m/s.
A. 0.34 m B. 0.73 m C. 1.2 m D. 1.6 m