A metal airplane flies horizontally at 200. m/s where the Earth's magnetic field
is vertical and is 45.0 ?T. If the wingspan is 25.0 meters:
(a) what emf is induced across the wings?
(b) what wingspan would produce 1.0 volt emf?
(c) The plane reverses direction. Does the polarity of the wingtip emf change, i.e., if the left wing was positive, does it now become negative?
(a) 0.225 volts
(b) 111. meters
(c) no polarity change
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A rectangular plate in plane stress is subjected to normal stresses ?x 5 35 MPa, ?y 5 26 MPa, and shear stress ?xy 5 14 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:
(A) 0.8
(B) 1.5
(C) 2.1
(D) 2.9
What is the preferred name for Mg3N2?
a. Magnesium trinitride b. Magnesium nitride c. Dimagnesium trinitride d. Manganese nitrate
A general condition that two waves undergo constructive interference is that
A. their phase difference is zero.
B. their phase difference is
C. their phase difference is
D. their phase difference is an even integral multiple of
E. their phase difference is an odd integral multiple of
The N14 nucleus consists of
A. 21 protons and 7 electrons. B. 7 protons and 7 neutrons. C. 14 protons. D. 14 neutrons.