A parallel plate capacitor with circular plates having radius 0.07 m is used to store energy. If it is desired to store 
in this capacitor, what must the separation distance be for a voltage of 1.5 kV?
A. 0.64 cm
B. 0.41 cm
C. 2.5 cm
D. 1.3 cm
D. 1.3 cm
Physics & Space Science
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The nuclei of atoms contain
a. electrons only. b. neutrons only. c. protons and electrons. d. protons and neutrons.
Physics & Space Science
Briefly describe how astronomers estimate the number of galaxies in the observable universe.
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science
The central region of an atom is called the ________.
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science
Imagine yourself in a universe that is exhibiting a blue shift. This must mean:
it's expanding much faster than our Universe. it's expanding, but in a jerky fashion. it's collapsing. it's in a steady state, neither expanding nor collapsing. there's no such thing as a blue shift of light waves.
Physics & Space Science