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Korolek [52]
3 years ago
15

Problem A. Consider the following initial value problem for a damped driven linear oscillator: m 2 + b** + kx} = f sin(St); x(0)

= a, x'(0) = C, where a,b,c, m, k, f, 12 are constants, and [m] = M, [t] = T, [2] = L. Find the dimensions of a,b,c, k, ſ, and 12.
Mathematics
1 answer:
skad [1K]3 years ago
7 0

Answer:

a = L

b = MT^(-1)

c = LT^(-1)

k = MT^(-2)

f = MLT^(-2)

S = T^(-1)

Step-by-step explanation:

x (0) = a

x is denoted by displacement in vibration analysis hence attains units of x.

Hence, a = L

b is the damping coefficient:

b = \frac{F}{\frac{dx}{dt} } \\= MLT^(-2) / LT^(-1)\\= MT^(-1)

x'(0) = c

dx/dt = velocity hence c attains the units of velocity

c = LT^(-1)

Coefficient k is the stiffness:

k = \frac{F}{x}  = \frac{MLT^(-2)}{L} = MT^(-2)

Coefficient f is the magnitude of the exciting force

F = m*acceleration = MLT^(-2)

Coefficient S is the angular frequency

angular frequency is displacement in radians per seconds; hence,

S = T^(-1)

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Answer:

height of the flag from the bottom of the boat ≈ 32 ft (nearest foot)

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