In the UNS designation system, high-strength low-alloy steels start with the letter _________.
Fill in the blank(s) with the appropriate word(s).
Answer: K
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Compared to our Sun, most stars in the halo are
A) old, red, and bright and have fewer heavy elements. B) old, red, and dim and have many more heavy elements. C) young, red, and dim and have fewer heavy elements. D) old, red, and dim and have fewer heavy elements. E) young, blue, and bright and have many more heavy elements.
Two loops of wire are arranged so that a changing current in one, the primary, will induce a current in the other, the secondary. The secondary loop has twice as many turns as the primary loop. The current in the primary at this moment is 6 A and increasing. The current in the secondary must be:
a. 3 A. b. 6 A. c. zero. d. There is insufficient information to work this problem.
A capacitor of capacitance C = 6 ?F is connected in series with a resistor R = 5 M? to a battery of emf E = 15 V. What is the value of the current in the circuit when the capacitor has reached 20% of its maximum charge?
A) 6.5 ?A B) 2.4 ?A C) 1.3 ?A D) 4.7 ?A E) 9.1 ?A
An unusual lightning strike has a vertical portion with a current of -400 A downwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 mT. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
a. 0. b. 0.012 N, East. c. 0.012 N, West. d. 0.30 N, West. e. 300 N, East.