The microwave background radiation:
a. represents the leftover glow from the Big Bang.
b. had its slight non-uniformity measured by COBE.
c. was discovered by Penzias and Wilson.
d. All of the above.
D
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In a binary system, the most massive star:
A) shows a large Doppler shift. B) is farthest from the balance point of the system. C) follows the largest orbit. D) is closer to the center of mass.
An object starts from rest at time t = 0.00 s and moves in the +x direction with constant acceleration. The object travels 12.0 m from time t = 1.00 s to time t = 2.00 s. What is the acceleration of the object?
A) -12.0 m/s2 B) 24.0 m/s2 C) -4.00 m/s2 D) 4.00 m/s2 E) 8.00 m/s2
On the average, in a ferromagnetic domain permanent atomic magnetic moments are aligned ____ to one another.
A. antiparallel B. parallel C. perpendicular D. alternately parallel and antiparallel E. randomly relative
The Department of Energy develops a new reversible engine which has a COP of 4 when operated as a refrigerator and a COP of 5 when operated as a heat pump. What is its efficiency when operated as an engine doing work?
A) 10.% B) 20.% C) 25.% D) 45.% E) 80.%