The redshift of the universe at decoupling was about:
A) Z = 1,000,000.
B) Z = 400,000.
C) Z = 1,100.
D) Z = 10.
E) Z = 4.
C
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Calculate the energy (in kW?h) given off if five kg of plutonium-239 undergoes complete fission. The energy released per fission is 200 MeV. (1 MeV = 1.6 × 10^?13 J)
a. 1.1E+11 kW?h b. 6.4E+12 kW?h c. 1.6E+16 kW?h d. 1.1E+8 kW?h e. 5.4E+9 kW?h
The force of attraction between Earth and any object located on its surface is generally referred to as the object’s
a) mass. b) momentum. c) inertia. d) weight.
How did Tycho Brahe's model of the universe differ from that of Ptolemy? How did Tycho Brahe's model of the universe differ from that of Copernicus?
What will be an ideal response?
In straight-line motion, if a moving object speeds up, the direction of the acceleration is ______________ the direction of the velocity
Fill in the blank(s) with correct word