Which of the following best describes the sizes of atoms?
A) Atoms are so small that millions of them could fit across the period at the end of this sentence.
B) Atoms are too small to see by eye, but can be seen with a handheld magnifying glass.
C) Most atoms are about a millionth of a meter (1 micrometer) in diameter.
D) Atoms are roughly the same size as typical bacteria.
A) Atoms are so small that millions of them could fit across the period at the end of this sentence.
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A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 starts from rest at t = 0. The wheel has a diameter of 20 cm. What is the magnitude of the total linear acceleration of a point on the outer edge of the wheel at t = 0.60 s?
A. 0.25 m/s2 B. 0.50 m/s2 C. 0.14 m/s2 D. 0.34 m/s2 E. 0.20 m/s2
A ball rolls off the edge of a table at the same time another ball drops vertically from the same table. The ball to hit the floor first is the
A) rolling ball. B) dropped ball. C) both hit at the same time
What is the potential at a distance of 0.0529 nm from a proton?
A. 13.6 no B. -13.6 no C. 27.2 V D. -27.2 no E. 9.11 pC
If an electric charge is rapidly shaken up and down,
A) sound is emitted. B) light is emitted. C) electron excitation occurs. D) an electromagnetic wave is produced.