Two neutron stars in a close binary are predicted to spiral into each other and eventually merge because they lose orbital energy through
A) the emission of gravitational waves.
B) strong x-ray emission of their accretion disks.
C) friction as they orbit through the gas of a surrounding accretion disk.
D) the exchange of mass from one to the other.
A) the emission of gravitational waves.
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Propene and cyclopropane are
a. the same compound. b. isomers. c. neither isomers nor the same compound.
Angular Quantities: The diameter of the Moon is 3.47 × 106 m, and it subtends an angle of 0.00904 rad when viewed from the surface of Earth. How far is the Moon from Earth?
Fill in the blank(s) with the appropriate word(s).
Which rocket would require more fuel?
A) one going from the Moon to Earth. B) one going from Earth to the Moon. C) both the same.
An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead