An astronaut traveling with a speed v = 0.90c holds a meterstick in his hand. If he measures its length, he will obtain a value of
a. 1.0 m
b. 2.3 m
c. 0.19 m
d. 0.43 m
e. 0.81 m
a
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What happens to a volume of water when its temperature is reduced from 8°C to 4°C?
a. density increases b. density decreases c. density remains constant d. vaporizes
The objective of most radio telescopes is similar to the objective of a reflecting optical telescope in that
a. they are both concave in shape b. they are both convex in shape c. they are typically the same size d. they are both made of metal. e. they have nothing in common.
The number of protons in a neutral atom is
A) called the mass number. B) zero. C) the same for all elements. D) equal to the number of electrons. E) equal to the number of neutrons.
If you stand in front of a concave mirror, exactly at its center of curvature,
A) you will see your image and you will appear smaller. B) you will see your image and you will appear larger. C) you won't see your image because there is none. D) you won't see your image because it's focused at a different distance. E) you will see your image at your same height; however it will be inverted.