An object is moving in a horizontal circle, in a clockwise direction (as viewed from above). In which direction does its angular momentum vector point?
A. Toward the viewer
B. Away from the viewer
C. From the ball toward the center of the circle
D. To the viewer's left
Answer: B
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What is Newton's Second law of motion?
A. Force equals mass times acceleration, F = ma. B. When two bodies interact, they create equal and opposite forces on each other. C. Every mass exerts a force on any other mass that is proportional to the product of the masses divided by the square of the distance between them. D. A body continues in a state of rest or uniform motion in a straight line unless made to change that state by forces acting on it.
A parcel of warmed air rises due to
A) random molecular motion. B) radiation. C) buoyancy. D) increased energy of its molecules.
What is the most likely reason that there are no giant planets beyond Neptune?
A) Any planets forming beyond Neptune would have drifted out of the solar system due to the weakness of the Sun's gravity at this distance. B) There was no material to create planetesimals beyond the orbit of Neptune. C) By the time planetesimals grew to a large enough mass to hold onto an atmosphere, the solar nebula had been blown away. D) Any planet forming beyond Neptune's orbit would have been scattered outside of the solar system by gravitational encounters. E) There may be, but they would be so faint that astronomers have not found them yet.
The vertical displacement of a string is given by y(x,t) = (6.00 mm) cos[(3.25 m-1)x - (7.22 s-1)t]. What is the period of the wave?
A) 7.22 s B) 1.93 s C) 0.870 s D) 0.308 s E) 0.139 s