The latest observations suggest the ratio of matter to energy is about
A) 24/73. B) 24/76. C) 3/24. D) 27/73. E) 3/97.
D
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A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N
What is the magnitude of the second charge? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) A) 10 nC B) 0.025 C C) 25 C D) 1.0 C E) 25 nC
To calculate the pressure in the standard atmosphere at 6000 m, the lapse rate is used. The percentage error, considering the pressure is nearest:
(A) 0.08% (B) 0.13% (C) 0.24% (D) 0.31%
Plane Mirrors: Two plane mirrors make an angle of 30° with each other. A light ray enters the system and is reflected once off of each mirror. Through what angle is the ray turned?
A. 60° B. 90° C. 120° D. 150°
A pulsar (a rotating neutron star) emits pulses at a frequency of 0.40 kHz. The period of its rotation is
A) 2.5 ms. B) 2.5 s. C) 0.025 s. D) 0.25 s. E) 25 ms.