Velocity Addition: Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from him in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Gamma moving?
A. 0.70c
B. 1.4c
C. 0.82c
D. 0.94c
E. 0.98c
Answer: D
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Two objects, a ring and a disk, both with equal mass and radii. Each is rotating about an axis through its center, as shown. Which has the greatest rotational inertia, I, a uniform disk or a ring?
A. They have the same I, since they both have the same mass and radius
B. The disk
C. The ring
Convergent boundaries are regions of
A) great mountain building. B) plate subduction. C) plate collision. D) plate collision, subduction, and mountain building.
If the net force acting on an object doubles, then the ________ doubles as well.
A. velocity B. speed C. acceleration D. mass
Suppose that a car traveling to the east (+x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration must be correct?
A) Its acceleration is in the +x direction. B) Its acceleration is in the -x direction. C) Its acceleration is zero. D) Its acceleration is decreasing in magnitude as the car slows down.