A jet has an angular length of 10 seconds of arc and flows from a star at a distance of 2,000 pc. How far does this jet extend away from the star?
a. 20,000 pc
b. 20,000 AU
c. 20, 000 ly
d. 20,000 miles
e. 20,000 km
B
You might also like to view...
According to the nebular theory, how did the Oort cloud form?
A) It is material left over from the interstellar cloud that never contracted with the rest of the gases to form the solar nebula. B) It is made of planetesimals that formed beyond Neptune's orbit and never accreted to form a planet. C) It consists of objects that fragmented from the Sun during a catastrophic collision early in the formation of the solar system. D) It is made of planetesimals between the orbits of Mars and Jupiter that never formed into a planet. E) It is made of planetesimals formed in the outer solar system that were flung into distant orbits by encounters with the jovian planets.
Process of Science: Inflation can explain some general features of the Universe but it is not directly testable and cannot be considered a theory
Indicate whether the statement is true or false
If a nucleus of ImageTh absorbs a neutron and the resulting nucleus undergoes two successive beta decays (emitting electrons), what nucleus results?
A) americium-232 B) plutonium-232 C) thorium-233 D) uranium-233
Why does convection occur in the troposphere, but not in the stratosphere?
A) The troposphere is warmer than the stratosphere. B) The troposphere is cooler than the stratosphere. C) Temperature decreases with altitude in the troposphere, but this trend reverses in the stratosphere. D) Density decreases with altitude in the troposphere, but this trend reverses in the stratosphere. E) The troposphere contains a smaller proportion of greenhouse gases than the stratosphere.