Series/Parallel Circuits: A 4.0-? resistor is connected to a 12-? resistor and this combination is connected to 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 value of voltage V?
A. 2.0 V
B. 3.0 V
C. 6.0 V
D. 1.5 V
E. 8.0 V
Answer: C
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In a typical transmission line, the current I is very small and the voltage V is very large. A unit length of line has resistance R. For a power line that supplies power to 10,000 households, we can conclude that
a. IV = I 2R. b. I = V/R. c. IV < I 2R. d. IV > I 2R. e. I 2R = 0.
A 7 cm diameter heat exchanger rod at 400ºC is surrounded by a 15 cm diameter heat shield. If the surroundings are a black body at 20ºC, determine the equilibrium temperature of the shield if (a) both rod and shield are black bodies, (b) emissivity of both is 0.7, and (c) the rod is a black body and the shield has emissivity of 0.7.
The number of _______________ on the Sun varies over an 11-year cycle
a. sunspots b. rays c. canals d. valleys
What is the activation energy?
A) the minimum amount of energy to break the bonds in reactants B) the amount of energy required to activate a phase change C) the energy difference between the reactants and the products D) the amount of energy required to separate reactants from the products E) the hill