An 8000 kg satellite is launched from the surface of the earth, and injected into outer space a long distance from the earth. The kinetic energy needed to launch the satellite into outer space is

A.

B.

C.

D.

E.


A.

Physics & Space Science

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Sgr A* emits radio waves

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

Why does a neon light appear red?

a) It produces ultraviolet light, which to our eyes appears red. b) The atoms of neon have electrons that are primarily red. c) It gives off an emission spectrum with mostly red spectral lines. d) The metal filament inside is heated to 1000 Kelvin. e) The gas in the bulb absorbers every other color besides red.

Physics & Space Science

Applying Newton's version of Kepler's third law (or the orbital velocity law) to the a star orbiting 40,000 light-years from the center of the Milky Way galaxy allows us to determine

A) the mass of the Milky Way Galaxy that lies within 40,000 light-years of the galactic center. B) the total mass of the entire Milky Way Galaxy. C) the mass of the black hole thought to reside in the center of the galaxy. D) the percentage of the galaxy's mass that is made of dark matter.

Physics & Space Science

Which of the following is a solution to the wave equation, ?

A.


B.
(cos kx) (sin ?t)

C.
e?x sin ?t

D.
e?x sin (kx??t)

E.
e?x cos t

Physics & Space Science