Which of the following steels has the highest hardenability?

(a) 1050
(b) 1080
(c) 4320
(d) 4340


(d) 4340

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science