What causes some asteroids leave the asteroid belt and sometimes approach Earth?
A. Because Earth's gravitational field attracts them.
B. Because Jupiter's gravitational field ejects them.
C. Because they crash into one another and get ejected.
Answer: B. Because Jupiter's gravitational field ejects them.
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Barbara travels 20. km Northward, then travels 40. km Eastward, then continues for 50. km in a Southward direction. What displacement will now take her back to her initial position?
A) 30. km Westward + 40. km Northward B) 50. km Northwest C) 40. km Westward + 30. km Northward D) 30. km Northward + 30. km Westward E) 40. km Eastward + 30. km Southward
In the final phases of its "life", our sun will
A) collapse to become a white dwarf. B) turn into a cockroach. C) blow up in a supernova explosion. D) pass through the white dwarf state, then the neutron star state, and finally the black hole state. E) collapse and continue to collapse, forever.
Determine
(a) For copper, determine the energies at which the probability of electron occupation is 0.9 and 0.1 at 300 K. (b) Are these energies symmetric about the Fermi energy of 7.04 eV?
What are the two parts of a shadow during an eclipse?
a. total and partial b. apogee and perigee c. sidereal and synodic d. waxing and waning e. umbra and penumbra