In each of Problems 18 through 21 , find the Laplace transform of the given function; a and b are real constants. Recall that cosh b t = ( e b t + e − b t ) / 2 and sinh b t = ( e b t − e − b t ) / 2 . sinh b t
In each of Problems 18 through 21 , find the Laplace transform of the given function; a and b are real constants. Recall that cosh b t = ( e b t + e − b t ) / 2 and sinh b t = ( e b t − e − b t ) / 2 . sinh b t
In each of Problems
18
through
21
, find the Laplace transform of the given function;
a
and
b
are real constants. Recall that
cosh
b
t
=
(
e
b
t
+
e
−
b
t
)
/
2
and
sinh
b
t
=
(
e
b
t
−
e
−
b
t
)
/
2
.
Solve the following problem and show your complete solutions. Explain your answers for better understanding.
This problem is an example of critically damped harmonic motion.
A hollow steel ball weighing 4 pounds is suspended from a spring. This stretches the spring
feet. The ball is started in motion from the equilibrium position with a downward velocity of 5
feet per second. The air resistance (in pounds) of the moving ball numerically equals 4 times
its velocity (in feet per second). Suppose that after t seconds the ball is y feet below its rest
position. Find y in terms of t.
Take as the gravitational acceleration 32 feet per second per second. (Note that the positive y
direction is down in this problem.)
y =
le
University Calculus: Early Transcendentals (4th Edition)
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