Because S-waves do not travel through Earth's outer core, scientists inferred that the outer core is
A) impenetrable.
B) molten liquid.
C) solid.
D) very dense.
Answer: B
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While a rock is falling straight down with negligible air resistance, it has
A) an unchanging speed. B) an increasing speed. C) a decreasing speed. D) zero speed. E) None of the above.
An object is placed 60 cm in front of a mirror and the image is upright and 1?4 the size of the object. What is the focal length of the mirror?
A. -12 cm B. -20 cm C. -45 cm D. -75 cm E. some positive value not given
A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions
What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.00 × 108 m/s) A) 162 N/C B) 212 N/C C) 82.1 N/C D) 150 N/C E) 52.9 N/C
An electron and a positron, both essentially at rest, annihilate each other, emitting two identical photons in the process
What is the wavelength of these photons? The mass of an electron or positron is 9.11 × 10-31 kg. (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s) A) 3.07 pm B) 1.21 × 10-12 pm C) 2.42 pm D) 1.73 pm E) 3.46 pm