In an astronomical telescope the secondary mirror is
a. concave. b. convex.
c. spherical. d. plane.
b
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Answer the following statement(s) true (T) or false (F)
1. The rod creates an electric field in that frame.
2. The rod creates a magnetic field in that frame.
3. The proton feels an electric force in that frame.
4. The proton feels a magnetic force in that frame. Now consider a frame moving along with the proton.
5. The rod creates an electric field in that frame
The organisms Homo habilis, Homo erectus, and Homo sapiens
A) are part of the same genus B) have nothing in common C) are part of the same genus and species D) are part of the same species
Future space stations will create an artificial gravity by rotating. Consider a cylindrical space station 390 m diameter rotating about its central axis. Astronauts walk on the inside surface of the space station
What rotation period will provide "normal" gravity? A) 28 s B) 40 s C) 6.3 s D) 4.4 s
The ability to carry large particle sizes is dependent on the stream's
A) laminar flow. B) velocity. C) discharge. D) channel geometry.