What types of events have scientists so far been able to detect with gravitational wave observatories, such as LIGO?
A) x-ray bursts
B) supernovae
C) mergers of closely-orbiting pairs of neutron stars or black holes
D) the gradual decay over many years of the orbits of binary neutron stars
C) mergers of closely-orbiting pairs of neutron stars or black holes
You might also like to view...
In brittle materials, the easiest way to increase the _________strength is to decrease the size of cracks and pores.
Fill in the blank(s) with the appropriate word(s).
If an object is stretched beyond its elastic limit, it does not return to its original length upon removal of the external force
Indicate whether the statement is true or false
Spherical Mirrors: If you stand in front of a convex mirror, at the same distance from it as its focal length,
A. you won't see your image because there is none. B. you won't see your image because it is focused at infinity. C. you will see your image and you will appear smaller than you. D. you will see your image and you will appear larger than you. E. you will see your image and it will be the same size as you except upside down.
The moons of Mars, Phobos (Fear) and Deimos (Terror), are very close to the planet compared to Earth's Moon. Their orbital radii are 9,378 km and 23,459 km respectively. What is the ratio of the orbital speed of Phobos to that of Deimos?
A) 0.2528 B) 0.3998 C) 1.582 D) 2.858 E) 3.956