In the summer in the northern hemisphere,
a. the Earth is closer to the Sun.
b. the Earth's northern hemisphere is tilted toward the Sun.
c. the Earth's northern hemisphere is tilted away from the Sun.
b
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If the Universe is closed and finite, then
a. the Universe will expand forever. b. the Universe has a center. c. the Universe has an edge. d. None of the other choices are correct.
Four identical particles (mass of each = 0.24 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the rotational inertia of this rigid body about an axis that passes through the center of mass of the body and is parallel to the shorter sides of the rectangle?
A. 2.4 kg?m2 B. 2.2 kg?m2 C. 1.9 kg?m2 D. 2.7 kg?m2 E. 8.6 kg?m2
The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence greater than this angle will be
A) absorbed. B) totally reflected. C) partially reflected and partially transmitted. D) totally transmitted. E) totally polarized.
A stone is thrown straight up. What is its acceleration on the way up?
What will be an ideal response?