Which of these is NOT a common misconception?
a. A light year is a unit of time.
b. Stars look like disks when seen through a telescope
c. A galaxy is a star plus its planets.
d. All of the other choices are misconceptions.
d
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It is possible to cool liquid copper sufficiently fast to form an amorphous structure.
a. True b. False
Art museums use weaker wires than those used in homes because paintings in museums
A) are suspended by pairs of vertical wires. B) are usually lighter in weight. C) are more firmly attached.
You have a heavy piece of equipment from a 1. mm diameter wire. Your supervisor asks what the length of the wire will be doubled without changing how far the wire stretches. What diameter must the new wire have?
A. 1.0 mm B. 1.4 mm C. 2.0 mm D. 4.0 mm
What form or forms of energy does a falling elastic ball have when it is at its most-squeezed position on the floor, before it begins to rebound [see figure above]?
A) Kinetic and gravitational and elastic B) Kinetic only C) Kinetic and elastic D) Gravitational only E) Elastic only