When a glass rod is rubbed with silk, which of the following statements best describes what happens?
a. Electrons are removed from the rod. c. The silk remains neutral.
b. Protons are removed from the silk.
d. The silk is charged positively.
A
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The ratio of the hydrostatic stress to the elastic volumetric strain is equal to the _____________modulus.
Fill in the blank(s) with the appropriate word(s).
Hypothetically, if Planck's constant were smaller, atoms would be
A) larger. B) smaller. C) no different in physical size.
The short lifetime of muons created in the upper atmosphere of the Earth would not allow them to reach the surface of the Earth unless their lifetime increased by time dilation. From the reference system of the muons, the muons can reach the surface of the Earth because:
a. time dilation increases their energy. b. time dilation increases their velocity. c. the relativistic speed of the Earth toward them is added to their velocity. d. length contraction decreases the distance to the Earth.
How does a lenticular galaxy differ from a normal spiral galaxy?
A) It has no bulge. B) It has an elongated bulge resembling a bar more than a sphere. C) It is flatter in shape. D) It has no gas or dust. E) It has no spiral arms.