Magnets may be found only
a. in natural domains in the environment where there is magnetite.
b. in pieces of all metals.
c. in domains.
d. where there are electric outlets.
e. where there are aligned domains in a material.
E
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A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse it has received from the gravitational force is
a. 9.80 Ns. b. 19.6 Ns. c. 29.4 Ns. d. 58.8 Ns. e. 118 Ns.
The last page of a book is numbered 764. The book is 3.0 cm thick. What is the average thickness of a sheet of paper in the book, in centimeters?
A) 0.0039 B) 0.0078 C) 127.3 D) 0.072 E) 254.7
When lightning strikes, nitrogen molecules, N2, and oxygen molecules, O2, in the air react to form nitrates, NO3?, which come down in the rain to help fertilize the soil. Is this this an example of oxidation or reduction?
A) The formation of nitrates is an example of oxidation. B) The formation of nitrates is an example of reduction. C) Both. The nitrogen is oxidized as it reacts with the oxygen while the oxygen is reduced. D) Neither. Although the bonds of both the N2 and O2 molecules are broken to form the NO3, neither oxidation nor reduction occurs.
Which of the following processes would be the most likely process for making continuous-fiber composite material for a high-pressure natural gas tank?
(a) Resin transfer molding (b) Vacuum bagging (c) Pultrusion (d) Filament winding