In general, you should choose existing content designed for print rather than creating original content elements prepared for the web.
Answer the following statement true (T) or false (F)
False
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According to the unified model of active galactic nuclei, ___________ is in the center surrounded by _____________with a Type 1 Seyfert or Type 2 Seyfert being seen depending on the viewing angle
a. a supermassive black hole; an accretion disk b. a supermassive black hole; empty space c. no black hole; an accretion disk d. no black hole; empty space
Negatively charged subatomic particles are known as:
a. neutrons b. protons c. electrons d. elements e. atoms
Potential of Point-Charges: Point charges +4.00 ?C and +2.00 ?C are placed at the opposite corners of a rectangle as shown in the figure. What is the potential at point A, relative to infinity, due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2) 
A. 0.899 kV B. 8.99 kV C. 89.9 kV D. 899 kV E. 8990 kV
How is Neptune's moon Triton important to our understanding of the Kuiper belt origin?
A. Triton has a backward orbit, which indicates that it was captured by Neptune from the Kuiper belt. The study of Triton helps to understand other Kuiper belt objects. B. Triton's orbit is very close to the Kuiper belt and it can capture comets that then hits its surface. C. The study of the Triton's surface helps to understand composition of Kuiper belt objects. D. Triton has a backward orbit, which indicates that there is a strong influence on it from the Kuiper belt. The study of Triton helps to calculate the characteristics of Kuiper belt objects. E. Triton's orbit is very close to the Kuiper belt and it can affect the orbits of comets and send them towards the Sun, which helps us to study the comets that travel close to Earth.