One unusual aspect of dark matter is
A) it exerts no gravitational force.
B) it moves faster than lightspeed.
C) it exerts a new kind of fundamental force, never observed before.
D) it does not interact with electromagnetic radiation.
E) its gravitational force pushes (or repels) instead of pulling.
D
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The object in a ray diagram is perpendicular to the principal axis but does not have one end lying on the principal axis. The minimum number of rays that must be drawn in this ray diagram in order to determine the position of the image is
a. 1. b. 2. c. 3. d. 4. e. 5.
Five children are pushing on a snowball; each is pushing with a force of 10.0 N. Each is pushing at an angle of 45
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