Using an orbit size of 8 kpc, and a period of 225 million years, the mass of our Galaxy is found to be closest to
A) 106 solar masses.
B) 108 solar masses.
C) 1010 solar masses.
D) 1011 solar masses.
E) 1012 solar masses.
D
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If the z-component of the magnetic field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation
Bz(x, t) = (1.25 ?T) cos[(3800 m-1)x - (1.14 × 10-12 rad/s)t], what is the largest that the y component of the electric field can be? (c = 3.0 × 108 m/s) A) 375 N/C B) 4.17 × 10-15 N/C C) 3.75 × 108 N/C D) 4.17 × 10-9 N/C E) 1.25 × 106 N/C
We live in the epoch called the
a. Quaternary. b. Ordovician. c. Holocene. d. Cenozoic.
According to Alan Guth, magnetic monopoles are not observed in our universe because
A) they are theoretically impossible. B) space expanded so much that they are exceedingly rare. C) of the presence of electromagnetic radiation. D) they easily collapse under the force of gravity.
List at least three qualities that would tend to make a type of astronomical object useful as a standard candle
What will be an ideal response?