Most ancient cultures believed that the Earth was
A) spherical and moving through space
B) flat and moving through space
C) spherical and motionless
D) flat and motionless
D
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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
Most ancient cultures believed that the Earth was
A) spherical and moving through space B) flat and moving through space C) spherical and motionless D) flat and motionless
The total mass of a binary system can be calculated from
a. the ratio of the angular separation from the center of mass of each of the stars. b. the distance to the binary and its radial velocity. c. the semi major axis and period of the orbit. d. the radial velocities of the two stars. e. the time required for the small star to eclipse the larger star.
At a rock concert, if the speakers are placed on the floor instead of higher up on a tower, state if the intensity of the sound you would hear, from the same distance away, is the same or different and why
What will be an ideal response?