A mirror with a focal length -25 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the height of the image?
A)
0.8 cm
B)
20 cm
C)
4.0 cm
D)
-0.8 cm
E)
-20 cm
A
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Why does Mars have more extreme seasons than Earth?
A) because it is farther from the Sun B) because it has a larger axis tilt C) because it has a much more eccentric orbit D) because it has more carbon dioxide in its atmosphere E) all of the above
An electrically charged atom is an
A) ion. B) isotope. C) both of these D) neither of these
What is the explanation of Earth's magnetism?
A) Subatomic particles known as "magnetic poles" reside in the Earth, with one type of magnetic pole residing at Earth's north pole and the other type of magnetic pole residing at Earth's south pole. B) It is caused by electrically charged material circulating within Earth's hot liquid core. C) Earth's magnetism a consequence of the world's physics professors all spinning in the same direction. D) It is caused by a separation of charge within the Earth, with positive static charge residing at one of Earth's poles and negative static charge residing at the other pole. E) It is caused by charged, or ionized, particles circulating in the air above the solid Earth.
The Earth's orbit has a mean radius of 1.5 × 108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014° due to parallax. How distant is the star, in km?
A) 1.2 × 1011 km B) 1.2 × 1014 km C) 1.2 × 1017 km D) 1.2 × 1020 km E) 1.2 × 1023 km