1. FORCED UNDAMPED HARMONIC MOTION, w = wo Let us examine the case where the forcing frequency and the natural frequency of the oscil- lator are the same, x" + x = A cos(wot) For the case of a suspension bridge, we can think of the supporting cables as springs and that the wind or marching soldiers can create the external force on the bridge. If we take bridge roadway to have a mass of 1,000 kg, and the spring constant of the cables as 25,000 Newtons/meter, and further more supppose the wind or the soliders create an external force on the bridge of f(t) = 4000 cos(wt) Newtons, the equation (4) becomes which simplifies to 1000x" +25000x = 4000 cos(wt) x" + 25x= 4 cos(wt) (a) If the Method of Undetermined Coefficients is used to find the solution to the following intial value problem, What is the form of the trial solution? Here w= wo x" 25x4 cos(5t), x(0) = 0, x'(0) = 0. (b) Using computer software app, graph the solution to the IVP on [0, 20] and include the graph with your worksheet. (c) What does this this solution indicate about the behavior of the Millennium Bridge when the forcing term has a frequency that is the same as the natural frequency of the bridge.

A local camera station is tracking a UFO sighting in the evening sky. Find the velocity and acceleration of the UFO in the r and theta directions and then find the velocity and acceleration in the x and y directions. 30 (theta dot)- .043 [rad/see] +.004308 [rad/sec'] 6000 [ft] 283 [ft/sec] 12.011 [f/sec] Y axis Х аxis

Please can i get a written working out of the answer. Thank you

A 12-lb weight stretches a spring 2 ft. The weight is pulled 8 in below theequilibrium position and given an initial downward velocity of 3 ft/sec. (Recallthat the downward direction is positive.) Find the motion of the weight as afunction of time, assuming that the damping force may be neglected.   *** Please show handwritten work - thank you