A positive ion is formed when
a. a neutral atom gains an electron c. a negative ion loses an electron
b. a neutral atom loses an electron d. all of the above
B
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An polyethylene bar (E 5 1.4 GPa, v 5 0.4) of diameter 80 mm is inserted in a steel tube of inside diameter 80.2 mm and then compressed by axial force P. The gap between steel tube and polyethylene bar will close when compressive load P is approximately:
(A) 18 kN
(B) 25 kN
(C) 44 kN
(D) 60 kN
The source of electrons in a simple electric circuit is
A) the voltage source. B) energy stored in the voltage source. C) energy released by the voltage source. D) the electrical circuit itself. E) none of the above
In a nuclear reaction, what value is conserved in addition to electric charge, energy, and momentum?
A) atomic number B) neutron number C) nucleon number D) all of the given answers E) none of the given answers
Dams at two different locations are needed to form a lake. When the lake is filled, the water level will be at the top of both dams. The Dam #2 is twice as high and twice as wide as Dam #1 . How much greater is the force of the water on Dam #2 than the force on Dam #1? (Ignore atmospheric pressure; it is pushing on both sides of the dams.)
a. 2 b. 4 c. 8 d. 16