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Nataly [62]
3 years ago
15

Which statement best describes energy in an open system? (2 points) All energy and matter are contained within the system. Energ

y and matter flow into and out of the system. Matter flows into and out of the system; energy does not. There is no energy in an open system; there is matter.
Physics
2 answers:
Alona [7]3 years ago
5 0
Energy and matter into and out
klemol [59]3 years ago
5 0
B.) Energy and matter flow into and out of the system.
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Find equation tangent to a circle at given point
vlabodo [156]

the equation of the tangent line must be passed on a point A (a,b) and perpendicular to the radius of the circle. <span>
I will take an example for a clear explanation:
let x² + y² = 4 is the equation of the circle, its center is C(0,0). And we assume that the tangent line passes to the point A(2.3).

</span>since the tangent passes to the A(2,3), the line must be perpendicular to the radius of the circle. 

<span>Let's find the equation of the line parallel to the radius.</span>

<span>The line passes to the A(2,3) and C (0,0). y= ax+b is the standard form of the equation. AC(-2, -3) is a vector parallel to CM(x, y).</span>

det(AC, CM)= -2y +3x =0, is the equation of the line // to the radius.

let's find the equation of the line perpendicular to this previous line.

let M a point which lies on the line. so MA.AC=0 (scalar product), 

it is (2-x, 3-y) . (-2, -3)= -4+4x + -9+3y=4x +3y -13=0 is the equation of tangent



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3 years ago
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