If the central engine for our Milky Way is a black hole of 3 million solar masses, then it has an event horizon about ________ kilometers across
Fill in the blank(s) with correct word
nine million
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The first planets around other stars were discovered
A) by Huygens, following his realization that other stars are Suns. B) by Galileo following the invention of the telescope. C) about a century ago. D) in the 1990s. E) in the 2010s.
An elephant radiates less heat for its size than smaller animals because
A) its radiating area is small compared to its volume. B) its radiating area is large compared to its volume. C) it is taller than smaller animals. D) it weighs more than smaller animals.
A region of space contains a uniform electric field oriented along the y-axis. A frame of surface area A is placed perpendicular to the y-axis in the xz-plane. The magnitude of the electric flux through this frame is ?0
A second frame is placed in the same electric field in such a way that the magnitude of the electric flux through it is ?0/2. How is the plane of second frame oriented with respect to the plane of the first one? A) at a 90° angle B) at a 60° angle C) parallel to the first frame D) perpendicular to the first frame E) at a 30° angle
Three equal negative point charges are placed at three of the corners of a square of side d. What is the magnitude of the net electric field at the center of the square? (k = 1/4??0 = 8.99 × 109 N • m2/C2)
What will be an ideal response?