Of what is the galactic halo composed?
What will be an ideal response?
The globular clusters are most obvious component, but the halo also has many loose stars of Population II, escaped from their clusters, and a great deal of dark matter, whose true nature is still uncertain.
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A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case
Case A: Thrown straight up. Case B: Thrown straight down. Case C: Thrown out at an angle of 45° above horizontal. Case D: Thrown straight out horizontally. In which case will the speed of the stone be greatest when it hits the water below if there is no significant air resistance? A) Case A B) Case B C) Case C D) Case D E) The speed will be the same in all cases.
How could you identify alpha, beta, and gamma rays coming from an ore sample?
If the magnetic field in an EM wave is in the x-direction and the electric field in the wave is in the y-direction, the wave is traveling in the
A) x-y plane. B) direction halfway between the x- and y-directions. C) z-direction. D) x-direction. E) negative z-direction.
Determine the change in length of a 20-m railroad track made of steel if the temperature is changed from -15°C to +35°C. (aSTEEL = 1.1 × 10^-5/°C)