The density of the universe is large enough that gravity alone will eventually halt its expansion
Indicate whether the statement is true or false
FALSE
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Which of the following is not considered a potential solution to the question of why we lack any evidence of a galactic civilization?
A) The galactic civilization is deliberately avoiding contact with us. B) There is no galactic civilization because we are the first species ever to achieve the ability to study the universe. C) There is no galactic civilization because all civilizations destroy themselves before they achieve the ability to colonize the galaxy. D) The galactic civilization probably is undetectable because they operate under different laws of physics from the ones we know.
In order to lift a bucket of concrete, you must pull up harder on the bucket than the bucket pulls down on you
A) True B) False
A series of fission reactions in which subsequent reactions are initiated by the neutrons produced in the previous reactions is called a
A) critical reaction. B) chain reaction. C) usion reaction. D) neutron catastrophe. E) chemical reaction.
Two parallel wires run in a north-south direction. The eastern wire carries 15.0 A southward while the western wire carries 6.0 A northward. If the wires are separated by 30 cm, what is the magnetic field direction at a point between the wires at a distance of 10 cm from the western wire?
A. 3.0
T
B. 6.0T
C. 15T
D. 27T
E. 90T