These diagrams represent four possible models for the universe. Which model presumes the existence of some type of dark energy in the universe?
A) accelerating universe
B) coasting universe
C) critical universe
D) recollapsing universe
E) All four models assume the existence of dark energy.
A) accelerating universe
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Ariel claims that a pulse is described by the equation 
where x and y are measured in cm and t in s. Miranda says that it is not possible to represent a pulse with this function because a wave must be a function of x + vt or x?vt. Which one, if either, is correct, and why?
A.
B.
C.
D.
E.
is infinite when x = 0.Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If vector 
is added to vector 
, the result is 
. If is subtracted from 
, the result is 
. What is the magnitude of ?
A. 5.1
B. 4.1
C. 5.4
D. 5.8
E. 8.2
Which two circuits are exactly equivalent?
a.
A and B
b.
B and C
c.
C and D
d.
D and E
e.
B and E
An asteroid approaches Earth so that when it is very far away it is traveling with a speed of 6500 m/s along a line that would miss the center of Earth by 8,500,000 m
Because of the gravitational attraction of Earth, it departs from this straight line and curves towards Earth, colliding with it. In what direction, below the local horizontal, is the asteroid traveling when it hits Earth? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A) 48° B) 58° C) 68° D) 78° E) 88°