A metallic sphere A of radius 1.00 cm is several centimeters away from a metallic spherical shell B of radius 2.00 cm. Charge 450 nC is placed on A, with no charge on B or anywhere nearby. Next, the two objects are joined by a long, thin, metallic wire (as shown in Fig. 25.20), and finally the wire is removed. How is the charge shared between A and B?
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Two particles, each having a mass of 3.0 ?g and having equal but opposite charges of magnitude 5.0 nC, are released simultaneously from rest when the two are 5.0 cm apart. What is the speed of either particle at the instant when the two are separated by 2.0 cm?
A. 2.1 m/s B. 1.5 m/s C. 1.8 m/s D. 2.4 m/s E. 3.2 m/s
A spiral (S or SB) galaxy contains
a. mostly lower-main sequence stars and giants. b. mostly upper main sequence stars and giants. c. mostly upper main sequence stars and gas and dust. d. upper and lower main sequence stars and gas and dust. e. mostly white dwarfs and supergiants.
A simple series circuit contains a 6.0-? resistor, an ideal 15-V DC power supply, and an 18-H inductor. What the time constant of this circuit?
A) 3.0 s B) 110 s C) 0.33 s D) None of the given answers are correct.
For the heat exchanger tube and fin arrangement shown write the node equations for nodes 2 and 5. Write the equations for both implicit and explicit methods.
