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tommy6668
18.07.2019 •
Mathematics
Which is the equation of the parabola?
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Ответ:
Step-by-step explanation:
The vertex form of a parabola is: y = a(x - h)² + k where
(h, k) is the vertexNOTE: p is the distance from the vertex to the focus
The vertex (h, k) is (2, -3)
Insert those values into the vertex formula to get:
Ответ:
The canyon is approximately 314 meters away
Explanation:
Speed of Sound
If we emit sounds in an open space where a large obstacle (like a mountain) is expected to return the sounds, then it will travel forth and back at a given speed for a certain time. We can assume the speed of sound is constant, so we could know the approximate distance of the mountain (or canyon in our case) by the known formula.
Where
is the speed of sound and t is half the time we hear our echo.
The speed of sound in m/s can be calculated from the approximate formula in terms of the temperature T in degrees Celsius
We have
, so
Let's compute x, for t=1.8/2=0.9 seconds
The canyon is approximately 314 meters away