The famed meteorite with carbonate rocks and possible microfossils came from:
A) Venus.
B) the Moon.
C) Mars.
D) Europa.
E) Comet Halley.
C
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Once black holes become dormant, they cannot become active galactic nuclei (AGN) again
Indicate whether the statement is true or false
A particle experiences a force given by F(x) = ? - ?x3. Find the potential field U(x) the particle is in. (Assume that the zero of potential energy is located at x = 0.)
A) U(x) = -?x + x4 B) U(x) = ?x - x4 C) U(x) = 3?x2 D) U(x) = -3?x2
A scalar quantity is defined as
A) a quantity that is specified by a numerical value only. B) a quantity that is specified by using both a numerical value and a direction.
In these figures, we see a boy named Billy riding a carnival ride called the Rotor and the free-body diagram for the forces acting on him. What must be the magnitudes of the vectors fwall,Billy and WEarth,Billy if Billy remains at the same height along the wall?
a. fwall,Billy is greater than WEarth, Billy to keep Billy from falling. b. The magnitudes of fwall,Billy and WEarth, Billy are equal. c. fwall,Billy depends on the magnitude of Nwall,Billy, but the magnitude of WEarth,Billy is always the same. d. Nwall,Billy and fwall,Billy must be equal in magnitude.