Each of us weighs slightly less inside the ground floor of a skyscraper than we do on the ground away from the skyscraper because the
A) gravitational force is shielded inside the building.
B) mass of the building attracts us upward slightly.
C) both of these
D) none of the above
Answer: B
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Uniform Electric Fields: Two isolated copper plates, each of area 0.40 m2, carry opposite charges of magnitude 7.08 × 10-10 C. They are placed opposite each other in parallel alignment, with a spacing of 4.0 cm between them. What is the potential difference between the plates? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 0.40 V B. 3.0 V C. 3.2 V D. 7.6 V E. 8.0 V
Explain why the majority of large modern telescopes are not refractors
What will be an ideal response?
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A filament of tungsten wire is 0.001 m in diameter, and the filament is heated to 2500 K. The work function of tungsten is 4.5 eV.
(a) Calculate the probability of electrons having sufficient energy to be emitted from the filament. (b) Calculate the emission current density from the tungsten wire. (c) What length of wire can produce a thermionic electron current of 1 A?