A horizontal wooden beam sags a bit when supported at its ends. In between the top and bottom surfaces is a region of
A) tension.
B) compression.
C) neither of these
Answer: C
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After one _______________. of 18 years 11 1/3 days, the pattern of eclipses repeats
Fill in the blank(s) with correct word
A steel wire hangs from a high-altitude balloon. The steel has unit weight 77 kN/m3 and yield stress of 280 MPa. The required factor of safety against yield is 2.0. The maximum permissible length of the wire is approximately:
(A) 1800 m (B) 2200 m (C) 2600 m (D) 3000 m
The circuit below contains 4 100-W light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?
A. A B. B C. C D. D E. C and D
If a 2.0-MeV neutron released in a fission reaction loses half its kinetic energy in each moderator collision, how many collisions are needed to reduce its kinetic energy to 1/25 eV?
A) 6 B) 18 C) 26 D) 30 E) 4