A copper wire is found to break when subjected to minimum tension of 36. N. If the wire diameter were half as great, we would expect the wire to break when subjected to a minimum tension of
A) 36. N
B) 26. N
C) 18 N
D) 9.0 N
E) 51. N
D
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An explosion of genetic diversity similar to that which occurred during the Cambrian Period hasn't happened recently, most likely because
A) evolution of life on Earth is no longer occurring B) such an explosion can occur only for simple organisms and not complex ones C) there are no more ecological niches available to allow this to happen D) of the widespread presence of efficient predators that make it much more difficult for entirely new organisms to appear
The simplest scope design, by Isaac Newton, uses only a primary mirror
Indicate whether the statement is true or false
The condition of ____________________ means that the force due to gravity pushing down on a layer is exactly equal to the pressure pushing outward on that layer
Fill in the blank(s) with correct word
The bell with the highest natural frequency is relatively
A) small. B) large. C) either of these