A 4-pound weight is hung on a spring and stretches it 1 foot. The mass spring system is then put into motion in a medium offering a damping force numerically equal to the velocity. If the mass is pulled down 6 inches from equilibrium and released, the initial value problem describing the position, x(t), of the mass at time t is x" -8x' +32x = 0, x (0) = , x' (0) = 0 6. • x" + 8x' + 32x = 0, ¤ (0) = ;, x' (0) = 0 %3D O g" + 8x' + 32x = 0, x (0) = 6, x' (0) = 0 O g" – 8x' + 32x = 0, ¤ (0) = 6, x' (0) = 0 %3D %3D

3. A projectile is fired with an initial velocity of 128 ft/s from a cannon at time t = 0 from a height of 32 ft above the ground and at an angle of 30° with the horizontal. (a) Determine: x '(0) and y'(0). (These values represent the horizontal and vertical components of the initial velocity vector.) (b) Use integration to determine the position equations: x(t) and y(t) for the projectile t seconds after being fired by assuming that the projectile is in freefall. Thus, x"(t)=0 ft/s² and y"(t)=-32 ft/s² for all t≥ 0. (Note: x"(t) and y"(t) are the horizontal & vertical components of the projectile's acceleration vector at time t.) (c) Determine the maximum height, H, of the projectile and its horizontal distance, D, from the launch site at the time that it achieves this height. (Hint: The maximal height is attained at the time, t*, at which y'(t*) = 0.) (d) Determine the range of the projectile, R. YA (0,32) - P. 32' 128 0=30° x'(0) y'(0) H R Pr=(x(t), y(t)) is the position of the…

2) Assume that the motion of a mass-spring system with damping is governed by d+b+8y = 0, y(0) = 1, y'(0) = 0. Find the equation of motion for b = 3.

Please show all work!! This most likely is made to be a probelm about mx''+bx'+kx=f(t) m = mass b = friction k = spring constant

As a spring is heated, its spring "constant" decreases. Suppose the spring is heated so that the spring "constant" at time t is k(t) = 9-t N/m. If the unforced mass-spring system has mass m = 2 kg and a damping constant b = 1 N-sec/m with initial conditions x(0) = 2 m and x'(0) = 0 m/sec, then the displacement x(t) is governed by the initial value problem 2x" (t) +x' (t) + (9 − t)x(t) = 0; x(0) = 2, x'(0) = 0. Find the first four nonzero terms in a power series expansion about t = 0 for the displacement. x(t) = ☐ +... (Type an expression that includes all terms up to order 4.) k(t)=9-t mrr 1 N-sec/m 2 kg heat x(t) x(0)=2 x'(0)=0