Consider again the civilization described in the previous question. (They live on a planet orbiting 10 AU from a close binary star system that consists of a 15 MSun red giant star and a 10 MSun black hole surrounded by an accretion disk)
One foolhardy day, a daring individual in their space force (let's call him Major Tom) decides to become the first of his species to cross the event horizon of the black hole. To add to the drama, he decides to go in wearing only a thin space suit, which offers no shielding against radiation, no cushioning against any forces, and so on. Which of the following is most likely to kill him first (or at least to start the process of killing him first)? A) tidal forces due to the black hole
B) X-rays from the accretion disk
C) the crush of gravity at the singularity embedded within the black hole
D) the sucking force from the black hole, which will cause his head to explode
B
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Compared to the Earth, Mars has experienced wild swings in its axis tilt over relatively short time periods. This is because of its
A) proximity to Jupiter and its lack of a large moon B) greater distance from the Sun C) slower rotation rate D) small size
A wire lying in the plane of this page carries a current directly toward the top of the page
What is the direction of the magnetic force this current produces on an electron that is moving perpendicular to the page and outward from it on the left side of the wire? A) perpendicular to the page and towards you B) perpendicular to the page and away from you C) toward the top of the page D) toward the bottom of the page E) The force is zero.
A cheetah can maintain its maximum speed of 100 km/hr for 35.0 seconds. What minimum distance must a gazelle running 80.0 km/hr be ahead of the cheetah to escape?
a. 194 m c. 70.0 m b. 167 m d. 125 m
A satisfactory model of the transverse strength of uniaxial composite materials is to assume that the fibers are _________in the composite material.
Fill in the blank(s) with the appropriate word(s).