In order for a substance to sustain a fission chain reaction, one important condition is that
A) each fissioning nucleus must release a sufficient number of neutrons.
B) the nuclei must collide with enough energy to overcome the electrical repulsion between them.
C) each fissioning nucleus must release a sufficient number of alpha-particles.
D) energy must be continually supplied from the outside.
E) the nuclei must stay in shape by maintaining a regular jogging program.
A
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Force F required to hold the 75-lb weight in equilibrium is:
(A) 37.50 lb
(B) 18.75 lb
(C) 56.25 lb
(D) 25.0 lb
The basic energy resource that fueled the "industrial revolution" was a form of
A) nuclear energy. B) thermal energy. C) gravitational energy. D) chemical energy. E) radiant energy.
Determine the largest permissible time step for a one-dimensional transient conduction problem to be solved by an explicit method if the node spacing is 1 mm and the material is (a) carbon steel 1C, and (b) window glass. Explain the difference in the two results.
GIVEN One-dimensional transient conduction in a 1-mm-thickness of carbon steel and window glass FIND (a) Largest permissible time step for each material
Smog is a mixture of smoke and
a. fog. b. CO2. c. O2. d. CO.