A cast iron pipe (L 5 12 m, weight density 5 72 kN/m3, d2 5 100 mm, and d1 5 75 mm) is lifted by a hoist. The lift points are 6 m apart. The maximum bending stress in the pipe is approximately:
(A) 28 MPa
(B) 33 MPa
(C) 47 MPa
(D) 59 MPa
(A) 28 MPa
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The discreteness of energy levels is best understood by considering the electrons to be
A) like tiny planets orbiting a sun. B) attached to the nucleus by massless springs. C) much less massive than the nucleus. D) all of the above E) none of the above
Answer the following statement(s) true (T) or false (F)
1. A current-carrying circular loop and a current-carrying straight wire create very different magnetic fields in the empty space that surrounds them. Even so, the curl of at a distance r from the center of the loop along its axis and the magnitude of the curl the same distance r from the wire’s center have the same numerical value.
Approximately how many extrasolar planets have been discovered to date?
A) tens B) hundreds C) thousands D) millions E) billions
The black hole in the core of a Seyfert galaxy consumes the equivalent of hundreds of solar masses a day
Indicate whether the statement is true or false