What do you do to the control rods of a reactor in order to shut it down?
a. push them into the core
b. pull them out of the core
c. nothing—it's the cooling water that shuts down the reactor
d. none of the above
A
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LR Circuits: As shown in the figure, a circuit consists of a resistor R = 22 ? in series with an ideal inductor L = 31 H having no resistance. At time t = 0 s, there is a 12-A current in the circuit. At time t = 5.0 s, what is the emf across the inductor?
A. 7.6 V B. 7.0 V C. 6.3 V D. 8.2 V E. 8.9 V
The location on Earth's surface directly above an earthquake's focus is called
a. the shadow zone. b. the epicenter. c. ground zero. d. the subduction zone.
What is the approximate diameter of the roundish region with a temperature of 300—500 K?
This frame from Figure 16.12 is from a supercomputer model of the formation of one of the first stars in the universe. Color indicates gas temperature: Blue and green represent cool gas (100—300 K), orange and red represent warm gas (500—3000 K), and yellow represents gas at intermediate temperatures (300—500 K). Use the information in the figure to answer the following questions.
Density: A hollow sphere of negligible mass and radius R is completely filled with a liquid so that its density is ?. You now enlarge the sphere so its radius is 2R and completely fill it with the same liquid. What is the density of the enlarged sphere?
A. 8 ? B. 4 ? C. ?/2 D. ? E. ?/8