According to the theory of cosmic inflation, during a brief early "inflationary period," the universe
A) expanded at lightspeed.
B) expanded at a speed that exceeded lightspeed.
C) expanded at a speed that was only slightly slower than lightspeed.
D) quickly became far more densely filled with matter.
E) quickly became far more densely filled with energy.
B
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Visible light consists of electromagnetic waves with wavelengths (in air) in the range 400 - 700 nm. What are the frequencies of visible light?
a. 
b. 
c. 
d. 
A plane truss composed of two steel pipes (E 5 210 GPa, d 5 100 mm, and wall thickness 5 6.5 mm) is subjected to vertical load W at joint B. Joints A and C are L 5 7 m apart. The critical value of load W for buckling in the plane of the truss is nearly:
(A) 138 kN
(B) 146 kN
(C) 153 kN
(D) 164 kN
A 6.00-kg block is in contact with a 4.00-kg block on a horizontal frictionless surface as shown in the figure. The 6.00-kg block is being pushed by a horizontal 20.0-N force as shown
What is the magnitude of the force that the 6.00-kg block exerts on the 4.00-kg block? A) 6.00 N B) 20.0 N C) 8.00 N D) 4.00 N E) 10.0 N
In addition to the proper motion, we also need the ________ to find the transverse velocity of a star across our line of sight
A) mass B) temperature C) composition D) parallax E) color