An ideal air-filled parallel plate capacitor with plate a separation of 4.0 cm has a plate area of 0.040 m2. What is the capacitance of this capacitor with air between these plates? (?0 = 8.85 × 10-12 C2/N ? m2 )
A) 89 pF
B) 8.9 pF
C) 0.89 pF
D) 8.9 µF
E) 8.9 nF
B
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(a) Determine the toughness of the 1045 steel specimen in Figure 6.22. (b) Compare this magnitude with the toughness of 1020 steel calculated in Example Problem 6.13, and explain the reason for the relative magnitudes of the toughness.
Light takes approximately one second to travel from Earth to the Moon. This means that the Moon is approximately
A) 1 astronomical unit from Earth. B) 1 light-year from Earth. C) 3000 kilometers from Earth. D) 300,000 kilometers from Earth. E) near the top of Earth's atmosphere.
One long wire carries a current of 30 A along the entire x axis. A second long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?
A. 4.0 ?T B. 5.0 ?T C. 3.0 ?T D. 7.0 ?T E. 1.0 ?T
Which scientific theory or theories of the atom agrees with all of the atomic experiments performed to date?
A) The quantum theory of the atom. B) The planetary theory of the atom. C) The Greek theory of the atom. D) Both the planetary theory and the quantum theory of the atom. E) None of the above theories agree with all of the atomic experiments performed to date.