In an astronomical telescope the secondary mirror is

a. concave. b. convex.
c. spherical. d. plane.


b

Physics & Space Science

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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

Physics & Space Science

The ability to carry large particle sizes is dependent on the stream's

A) laminar flow. B) velocity. C) discharge. D) channel geometry.

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science