Objects moving at relativistic speeds appear to observers at rest to be
A) stretched.
B) shrunken.
C) either depending on direction of motion.
D) none of the above
Answer: B
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A description of the severity of the damage caused by an earthquake is given by its ranking on the ______________ scale
Fill in the blank(s) with correct word
The interior layer just below the crust of Earth is called the ________.
A. inner core B. mantle C. troposphere D. outer core
A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal -100 cm focal length. What is the size of the image formed?
A. 5.0 cm B. 7.2 cm C. 7.5 cm D. 30 cm E. 12 cm
Several forces act on an object at rest. It is known that the sum of the forces acting on the object is zero. Which statement is necessarily true?
A) The object will remain stationary. B) The object's center of mass may move in such a way that the object will roll without slipping. C) The object's center of mass will not move, but the object may begin to rotate. D) The object's center of mass may accelerate and the object may begin to rotate. E) The object's center of mass may accelerate, but the object will remain in the same orientation.