An object of mass 2 grams hanging at the bottom of a spring with a spring constant 3 grams per second square is moving in a liquid with damping constant 4 grams per second. Denote by y vertical coordinate, positive downwards, and y = 0 is the spring-mass resting position. (a) Write the differential equation y" = f(y, y') satisfied by this system. f(y, y')= -2yp-3/2y Note: Write t for t, write y for y(t), and yp for y' (t). (b) Find the mechanical energy E of this system. E(t)= yp^2+(3y^2)/2 Note: Write t for t, write y for y(t), and yp for y' (t). (c) Find the differential equation E' = F(y') satisfied by the mechanical energy. F(y')= Σ Note: Write t for t, write y for y(t), write yp for y' (t), write E for E(t). M Σ

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An object of mass 2 grams hanging at the bottom of a spring with a spring constant 3 grams per second square is moving in a liquid
with damping constant 4 grams per second. Denote by y vertical coordinate, positive downwards, and y = 0 is the spring-mass
resting position.
(a) Write the differential equation y" = f(y, y') satisfied by this system.
f(y, y') =
-2yp-3/2y
Note: Write t for t, write y for y(t), and yp for y' (t).
(b) Find the mechanical energy E of this system.
E(t) =
= yp^2+(3y^2)/2
M
F(y') =
=
Note: Write t for t, write y for y(t), write yp for y' (t), write E for E(t).
Note: Write t for t, write y for y(t), and yp for y' (t).
(c) Find the differential equation E' = F(y') satisfied by the mechanical energy.
M
M
Transcribed Image Text:An object of mass 2 grams hanging at the bottom of a spring with a spring constant 3 grams per second square is moving in a liquid with damping constant 4 grams per second. Denote by y vertical coordinate, positive downwards, and y = 0 is the spring-mass resting position. (a) Write the differential equation y" = f(y, y') satisfied by this system. f(y, y') = -2yp-3/2y Note: Write t for t, write y for y(t), and yp for y' (t). (b) Find the mechanical energy E of this system. E(t) = = yp^2+(3y^2)/2 M F(y') = = Note: Write t for t, write y for y(t), write yp for y' (t), write E for E(t). Note: Write t for t, write y for y(t), and yp for y' (t). (c) Find the differential equation E' = F(y') satisfied by the mechanical energy. M M
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