If you want to see the image formed by a telescope, you should place your eye at the location of the telescope's
A) focus.
B) primary mirror.
C) secondary mirror.
D) central hole in the primary mirror.
E) Cassegrain.
A) focus.
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Conservation of charge means that
a. The total amount of charge in the universe is constant. b. No experimenter has ever seen a single charge destroyed by itself. c. Electrons by themselves can be neither created nor destroyed. d. Charge can be neither created nor destroyed. e. All of the above.
The normal U.S. average annual radiation dose per person is about how many REM?
What will be an ideal response?
The combination of two separated point charges of opposite sign but equal magnitude is called an electric:
a. magnapole. c. quadrapole. b. dipole. d. monopole.
Two balls are thrown from the top of a building. One is thrown up and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street?
A. they are traveling at the same speed B. the one thrown down is traveling faster C. the one thrown up is traveling faster D. it depends on the height of the building