Which of the following correctly describes the concept of galactic recycling?
A) New stars are continuously being formed in the Milky Way out of gas that has been ejected from a previous generation of stars.
B) In the formation of a star, no matter is wasted as all excess material ends up recycled into planets.
C) Stars near the center of the Milky Way are continually recycled to the outskirts of the disk by their orbital motion.
D) Life is continuously being spread from star to star in the Milky Way.
E) New galaxies are continuously being formed out of gas ejected from a previous generation of galaxies.
A
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How does Rigel, a bluish star, surface temperature compare to Betelgeuse, a reddish star.
A. Rigel's surface temperature is less than Betelgeuse's. B. Rigel's surface temperature is greater than Betelgeuse's. C. They have the same surface temperature because they are both members of the constellation Orion. D. It is impossible to say without knowledge of the sizes of the stars.
A friend produces a Geiger counter to check the local background radiation
It ticks. Another friend, who normally fears most that which is understood least, makes an effort to keep away from the region of the Geiger counter and looks to you for advice. What do you say? A) Run away as fast as you can! B) The Geiger counter is emitting radiation. C) The Geiger counter is detecting naturally occurring radiation from your body. D) Wear heavy clothes.
Which Uranian satellite appears to have been the most geologically active?
a. Titania b. Ariel c. Miranda d. Umbriel e. Oberon
A magnetic field of 2.00 T is applied to a bubble chamber to make the tracks of protons and other charged particles identifiable by the radius of the circles they move in. If a high-energy proton moves along an arc of a 3.30-m circle, what is the momentum of the proton? [q = 1.60 × 10^?19 C, m = 1.67 × 10^?27 kg]