angvtl02

03.09.2021 • 

Mathematics

Nuclear experiments performed in the ocean vaporize large quantities of salt water. Salt boils and turns into vapor at 1738 K. After being vaporized by a 10-megaton force, the salt takes at least 8-10 seconds to cool enough to crystallize. The amount of salt A that has crystallized t seconds after an experiment is sometimes calculated using A = kt/T, where k and T are constants. Solve this equation for t.
t =

Ответ:

askharoun2005

04.08.2021

Mathematics

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(2,4.58) is on the circle. The distance from original to point (x,y) is \sqrt(x^2+y^2). Since (x,y) is on the circle centered at the origin with radius 5, x^2+y^2=5^2=25. Among the choices given, only 2^2+4.58^2=5^2, so point (2, 4.58) is on the circle.

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