Which of the following describes a major danger of interstellar travel at near-light speed?
A) Atoms and ions in interstellar space will hit a fast-moving spacecraft like a flood of dangerous cosmic rays.
B) Any interstellar journey will take much longer than the lives of the crew members.
C) Time dilation will slow the heart beats of the crew to a dangerously low rate.
D) Asteroid fields floating in interstellar space will present a navigational challenge.
A) Atoms and ions in interstellar space will hit a fast-moving spacecraft like a flood of dangerous cosmic rays.
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The lowest-mass object that can initiate thermonuclear fusion of hydrogen has a mass of about
a. 1 solar masses. b. 80 solar masses. c. 8 solar masses. d. 0.08 solar masses. e. 0.001 solar masses.
What is the inductance of a series RL circuit in which R = 1.0 K? if the current increases to one-third of its final value in 30 ?s?
a. 74 mH b. 99 mH c. 49 mH d. 62 mH e. none of the above
Three equal charges of magnitude + 4.00 ?C are placed at the corners of an equilateral triangle of side 2.00 cm. What is the electric potential energy of the system of these charges?
A) 90.0 J B) 900 mJ C) 0 J D) 216 mJ E) 21.6 J
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What is the maximum number of reflections a light ray entering one end will make before it emerges from the other end? A) 84,000 B) 42,000 C) 26,000 D) 24,000 E) 18,000