Rubber rods charged by rubbing with cat fur repel each other. Glass rods charged by rubbing with silk repel each other. A rubber rod and a glass rod charged respectively as above attract each other. A possible explanation is that
a. Any two rubber rods charged this way have opposite charges on them.
b. Any two glass rods charged this way have opposite charges on them.
c. A rubber rod and a glass rod charged this way have opposite charges on them.
d. All rubber rods always have an excess of positive charge on them.
e. All glass rods always have an excess of negative charge on them.
C
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A cylindrical tank is assembled by welding steel sections circum-ferentially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pres-sure is 2.0 MPa. The maximum shear stress in the cylindrical part of the tank is approximately:
(A) 17 MPa
(B) 26 MPa
(C) 34 MPa
(D) 38 MPa
Death Valley in California receives many German tourists. When you convert a summer temperature reading of 130°F to the Celsius scale they use at home, you find that the Celsius temperature is about
a. 26°C. b. 54°C. c. 72°C. d. 176°C e. 327°C.
The major advantage of MHD generators over conventional generators is that MHD generators
A) do not use electromagnetic induction. B) do not require magnets. C) require no power input. D) all of the above E) none of the above
Series/Parallel Circuits: A 4.0-? resistor is connected with a 12-? resistor and both of these are connected across an ideal dc power supply with voltage V as shown in the figure. If the total current in this circuit is I = 2.0 A, what is the current through the 4.0-? resistor?
A. 2.0 A B. 2.5 A C. 0.5 A D. 3.0 A E. 1.5 A