Which star is older?
A) an M star in the globular cluster M13
B) an A star in the globular cluster M13
C) Both stars (the A and M star) are the same age.
A
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For a fixed control volume, the reason why the equation below is:
(A) The integrand is independent of time
(B) The limits of integration are independent of time
(C) The flow is a steady flow
(D) The quantity ?? is independent of position
Answer the following statement(s) true (T) or false (F)
1. One can create an electric field that at a point P in empty space points directly toward P at all nearby points.
The solar nebula theory is NOT able to explain which of the following observed characteristics of the solar system? Another theory would be needed
a. Common direction of rotation of the planets. b. Common direction of revolution of the planets. c. The formation of hydrogen atoms in the solar system from subatomic particles. d. The density of the Jovian planets.
Standing waves can be set up in a string when two waves that are
a. of the same frequency and amplitude, but are opposite in direction of travel, meet each other. b. of the same frequency, amplitude, and direction of travel are also 180° out of phase. c. of the same frequency, amplitude, and direction of travel meet each other. d. of the same frequency, amplitude, and velocity meet each other.