2. A mass that weighs 64 lb stretches a spring 0.8 ft. The mass is attached to a dashpot mechanism that has a damping coefficient of 8 lb s/ft and is acted on by an external force of 60 cos(4t) lb. The mass is set in motion from its equilibrium position with no initial velocity. Let y(t) denote the displacement (in ft) of the mass from its equilibrium position after t seconds. (a) Find an initial-value problem which describes this process. (You may use the fact that g = 32 ft/s? and 1 ft=12 in.) (b) Is the system underdamped, overdamped, or critically damped? Justify your an- Swer.

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2. A mass that weighs 64 lb stretches a spring 0.8 ft. The mass is attached to a dashpot
mechanism that has a damping coefficient of 8 lb s/ft and is acted on by an external
force of 60 cos(4t) lb. The mass is set in motion from its equilibrium position with no
initial velocity. Let y(t) denote the displacement (in ft) of the mass from its equilibrium
position after t seconds.
(a) Find an initial-value problem which describes this process.
(You may use the fact that g = 32 ft/s' and 1 ft=12 in.)
(b) Is the system underdamped, overdamped, or critically damped? Justify your an-
swer.
Transcribed Image Text:2. A mass that weighs 64 lb stretches a spring 0.8 ft. The mass is attached to a dashpot mechanism that has a damping coefficient of 8 lb s/ft and is acted on by an external force of 60 cos(4t) lb. The mass is set in motion from its equilibrium position with no initial velocity. Let y(t) denote the displacement (in ft) of the mass from its equilibrium position after t seconds. (a) Find an initial-value problem which describes this process. (You may use the fact that g = 32 ft/s' and 1 ft=12 in.) (b) Is the system underdamped, overdamped, or critically damped? Justify your an- swer.
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