Line segment BA is tangent to the circle. A circle is shown. Secant D B and tangent B A intersect at point B outside of the circ
le. Secant D B intersects the circle at point C. The length of A B is x, the length of BC is 55, and the length of C D is 120. What is the length of the line segment BA? Round to the nearest unit.
18 units
65 units
88 units
98 units
18 units
65 units
88 units
98 units
2 answers:
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Answer:
Step-by-step explanation:
Given that:
The equation of the damped vibrating spring is y" + by' +2y = 0
(a) To convert this 2nd order equation to a system of two first-order equations;
let y₁ = y
y'₁ = y' = y₂
So;
y'₂ = y"₁ = -2y₁ -by₂
Thus; the system of the two first-order equation is:
y₁' = y₂
y₂' = -2y₁ - by₂
(b)
The eigenvalue of the system in terms of b is:
(c)
Suppose , then λ₂ < 0 and λ₁ < 0. Thus, the node is stable at equilibrium.
(d)
From λ² + λb + 2 = 0
If b = 3; we get
Now, the eigenvector relating to λ = -1 be:
Let v₂ = 1, v₁ = -1
Let Eigenvector relating to λ = -2 be:
Let m₂ = 1, m₁ = -1/2
∴
So as t → ∞