The hydrogen in the universe was formed by the energy of the Big Bang
Indicate whether the statement is true or false
T
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Which hypothetical universe will eventually contract, if there were no dark energy?
A) the universe with 1.5 times the critical density of matter B) the universe with 1.0 times the critical density of matter C) the universe with 0.5 times the critical density of matter
Five objects of mass m move at velocity 
at a distance r from an axis of rotation perpendicular to the page through point A, as shown below. The one that has zero angular momentum about that axis is
A.
B.
C.
D.
E.
A satellite is orbiting the earth. If a payload of material is added until it doubles the satellite's mass, the earth's pull of gravity on this satellite will double but the satellite's orbit will not be affected
A) True B) False
Which one of the choices below represents the preferred practice regarding significant figures when adding the following: 15.9 + 14 + 77.68 + 6.898?
a. 114.4780 b. 114.478 c. 114.48 d. 114.5 e. 114