The Earth is closest to the Sun in which month of the year?
July
June
March
January
January
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A thin uncharged conducting spherical shell has a charge q carefully placed at its center through a small hole in the shell. The charge q does not touch the shell. What is the charge on the outer surface of the shell?
a. q b. ?q c. 2q d. 0
Which of the following statements about electrons is not true?
A) Electrons orbit the nucleus rather like planets orbiting the Sun. B) Within an atom, an electron can have only particular energies. C) An electron has a negative electrical charge. D) Electrons have little mass compared to protons or neutrons. E) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels.
Two +6.0-µC charges are placed at two of the vertices of an equilateral triangle having sides 2.0 m long. What is the electric potential at the third vertex, relative to infinity, due to these charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 108 V B) 54 kV C) 90 kV D) 0 V E) 27 kV
The first stage in planetary evolution is cratering
a. True b. False Indicate whether the statement is true or false