A long straight line of charge has a uniform positive charge per unit length ?. The line is partially enclosed in a long rectangular box of length L and ends of area A, the line running through the center of each end
The electric flux through the surface of the box is
?L/ ?O.
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What do we mean by the event horizon of a black hole?
A) It is the point beyond which neither light nor anything else can escape. B) It is the center of the black hole. C) It is the distance from the black hole at which stable orbits are possible. D) It is the place where x-rays are emitted from black holes.
This figure shows observations that have allowed astronomers to determine the orbits of several stars around Sgr A* (the central object). What can we learn about Sgr A* by analyzing these orbits?
A) its mass B) its age C) its chemical composition D) all of the above
Other astronomers were skeptical about Percival Lowell's claims of Martian canals because
A) it did not seem possible for his telescope to see the surface through its thick atmosphere B) they discovered that Lowell suffered from poor vision C) they were able to prove that Lowell's telescope was faulty D) when they pointed their own telescopes toward Mars they couldn't see them
For a galaxy to be active, the supermassive black hole needs to have matter flow into it
a. True b. False Indicate whether the statement is true or false