Why doesn't a brown dwarf become a star?
A) It does not have enough mass for its core to get hot enough to start fusion reactions before degeneracy pressure prevents further collapse.
B) It always has a companion star that is hotter, and therefore, the brown dwarf is more like a planet than a star.
C) It does not have enough heavy elements to start fusion reactions.
D) Its luminosity is not high enough to qualify as an official star.
A) It does not have enough mass for its core to get hot enough to start fusion reactions before degeneracy pressure prevents further collapse.
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Conversion of Units: Rover eats 0.50 pound of dry dog food per day. How many 5.0-kg sacks of dog food does his owner need to buy in a year? (1.0 kg weighs 2.2 lb)
A. 17 B. 25 C. 52 D. 80 E. 81
The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0.939 W/m2. The wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles
How much total electromagnetic energy falls on the area during 1.0 minute? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 170 J B) 210 J C) 250 J D) 300 J E) 340 J
Which of the following is not a property of an aqueous solution of an acid?
a. Reacts with many metals to liberate hydrogen gas b. Changes the color of litmus dye from red to blue c. Tastes sour d. Conducts an electric current
Motional Emf: A airplane having a metal surface and a wingspan of 25.0 m flies horizontally at 200. m/s where the earth's magnetic field is vertical with magnitude 45.0 ?T.(a) What emf is induced across the wings?(b) What wingspan would the plane need to produce 1.00-V emf across its wings?(c) The plane now reverses direction. Does the polarity of the wingtip emf change? That is, if the left wing was positive before, does it now become negative?
What will be an ideal response?