A certain vibrating system satisfies the equation u'' + γu' + u = 0. Find the value of the damping coefficient γ for which the quasi period of the damped motion is 90% greater than the period of the corresponding undamped motion.

The value of the damping coefficient γ is (6/19)√29, which is approximately 1.70058.

Step-by-step explanation:

Given that a certain vibrating system satisfies the equation

u'' + γu' + u = 0

We wish to find the value of the damping coefficient γ for which the quasi period of the damped motion is 90% greater than the period of the corresponding undamped motion.

The period of the undamped motion T is 2π

The quasi period T_d is (4π)/√(4 - γ²)

Since the quasi period is 90% greater than the period of the undamped motion, we have

T_d = 1.9T

So that we can finally obtain

γ as 1.70058.

THE STEP-BY-STEP WORKING IS SHOWN IN THE ATTACHMENTS.

$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.