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Fundamentals of Differential Equations and Boundary Value Problems
- Consider a spring mass system with a 144 lb object attached. Suppose the object stretches the spring 18 inches in equilibrium. If the object is initially displaced 8 inches above equilibrium and given an initial velocity of -2 ft/s, find its displacement y in feet as a function of time t. Assume that this motion is undamped and that the spring is not deformed in the process. y(t) = feetarrow_forward(Please solve by hand)arrow_forwardA spring has a mass of 10 kg, is underdamped with coefficient β = 5 and its frequency is 0.8 Hz. Spring starts 30 cm from equilibrium position and is released with a velocity of −10 cm / s. Set up, in terms of the spring constant k, an equation and conditions for the position of the mass, in meters.arrow_forward
- Suppose a spring with spring constant 2 N/m is horizontal and has one end attached to a wall and the other end attached to a 4 kg mass. Suppose that the friction of the mass with the floor (i.e., the damping constant) is 1 N. s/m, and the forcing function is F(t) = 2 cos(2t). Determine the steady-state response of the system. Ysteady-state help (formulas)arrow_forwardA piece of chicken is boiled until its internal temperature reaches 165 °F. The chicken is then transferred to a refrigerator held at 49 °F to cool down. The internal temperature of the chicken at time t is given by T(t), and the temperature obeys Newton's law dT = -k(T - Tm) where Tm is the temperature of the refrigerator and k > 0 is a constant. After 5 minutes in the refrigerator, the internal temperature of the chicken is 155 °F. How long will it take for the temperature of the chicken to reach 70 °F?arrow_forwardA mass of 4kg stretches a spring 40cm. Suppose the mass is displaced an additional 4cm in the positive (downward) direction and then released. Suppose that the damping constant is 2 N s/m and assume g = 9.8 m/s² is the gravitational acceleration. (a) Set up a differential equation that describes this system. Let a to denote the displacement, in meters, of the mass from its equilibrium position, and give your answer in terms of 1, x', " (b) Enter the initial conditions: (0) = m T'(0) (c) Is this system under damped, over damped, or critically damped?? m/sarrow_forward
- A 288 pound object is suspended from a spring. The spring stretches an extra 9 inches with the weight attached. The spring-and-mass system is then submerged in a viscous fluid that exerts 16 pounds of force when the mass has velocity 2 ft/sec. What is the differential equation for this spring-and-mass system? (Use u as the dependent variable.) This system is ? For what value of y would the system be critically damped? (if the given system is already critically damped, enter the given value for y.)arrow_forwardA mass of 4kg stretches a spring 20cm. Suppose the mass is displaced an additional 6cm in the positive (downward) direction and then released. Suppose that the damping constant is 1 N . s/m and assume g = 9.8 m/s² is the gravitational acceleration. (a) Set up a differential equation that describes this system. Let a to denote the displacement, in meters, of the mass from its equilibrium position, and give your answer in terms of x, x', (b) Enter the initial conditions: x (0) m, x' (0) m/sarrow_forwardSolve the following system: -y+t. = dt du = x-t dtarrow_forward
- A mass weighing 16 lb stretches a spring 1/4 feet. The mass is attached to a viscous damper with a damping constant of 2 lb-s/ft and is set in motion from its equilibrium position with a downward velocity of 1/2 ft/s. a) Set up the initial value problem (differential equation). b) Solve the equation to find the position of the mass y at any time t. c) Determine when the mass first returns to its equilibrium position. Assume that the y-axis is directed downward.arrow_forwardA linear second-order non-homogeneous equation models this scenario: People falling at a height of 100ft above the ground attached to a 100-foot rope into a pit that's cut off at 50 feet underground. Spring constant of the rope is 120 lbs/ft, and air resistance is 5 times the instantaneous velocity. Write this scenario as an initial value problem as a system of linear first-order differential equations. Attached is the equation. M is the mass of person falling and g is gravity constant.arrow_forwarddv A model for the velocity v at timetof a certain object faling under the influence cf gravity in a viscous medium is given by the equation 1-. From the direction field shown in the figure to the right, skotch the dt 12 solutions with the initial conditions v(0) = 10, 12, and 19. Why is the value v= 12 calied the "terminal velocity"? Choose the correct skelch of the solutions with the initial conditions v(0) = 10, 12, and 19. O A. OB. Oc.arrow_forward
- Linear Algebra: A Modern IntroductionAlgebraISBN:9781285463247Author:David PoolePublisher:Cengage Learning