Which of the following steels has the highest hardenability?
(a) 1050
(b) 1080
(c) 4320
(d) 4340
(d) 4340
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The Emergency Core Cooling System is used in the event of an accident to ________
a. stop the fission reactions b. reduce fuel rod temperatures c. provide backup power to control rods d. change the decay heat of the fuel pellets
How many stars can you see with your naked eye on a clear, moonless night from a dark location?
A) fewer than a thousand B) a few thousand C) about ten thousand D) about a hundred thousand E) more than you could count in your lifetime
This photograph shows x-ray emission from a supernova remnant. What is the source of the x-rays?
A) hot gas expanding outward from the site of a supernova B) cold gas that will soon give birth to new stars C) accretion disk around a black hole near the center of the supernova remnant D) spots within the remnant where hot gas is crashing into and destroying planets
The electric potential at two points in space is: V1 = 200 volts and V2 = 300 volts. Which of the following statements is true for moving a point charge q from point 1 to 2?
A. The work done by an external agent to move q from point 1 to 2 is positive. B. We can't determine the work done because we don't know the direction of V at the two points. C. The work done by the electric force exerted on q in moving it from point 1 to 2 is W = –q(100 V).
1.A 2.B 3.C 4.A and B 5.A and C 6.B and C 7.A, B, and C 8.None of the above