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1. A sign structure is subjected to the uniform wind loading of 1.5 kPa. Determine the stress components at points A, B, C and D on the100 mm diameter supporting structure. Show the results on a volume element located a teach of these points.
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(a) The first-order system has the transfer function T(s)=\frac{A}{1+s T} Find the system output response in time domain when a unit ramp signal, r(t)=t, is applied to its input. (b) The transfer function of a second-order system is: T(s)=\frac{4}{s^{2}+4 s+4} Find the system output response in time domain when a unit ramp signal, r(t)=t, is applied to its input. \text { (Note: The inverse Laplace transform of } F(s)=\frac{1}{(s+a)^{2}} \text { is } f(t)=t \cdot e^{-a t} \text {.) }

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1. Reduce the block diagram shown in Figure P5.1 to a single transfer function, T(s) = C(s)/R(s). Use the following methods: R(s) a. Block diagram reduction [Section: 5.2] b. MATLAB 50 s+1 2 S FIGURE P5.1 S 2 MATLAB ML C(s)

P1.5 A light-seeking control system, used to track the sun, is shown in Figure P1.5. The output shaft, driven by the motor through a worm reduction gear, has a bracket attached on which are mounted two photocells. Complete the closed-loop system so that the system follows the light source./nMotor S Gears € Photocell tubes * Light source FIGURE P1.5 A photocell is mounted in each tube. The light reaching each cell is the same in both only when the light source is exactly in the middle as shown.

B. The transfer function of a system is: T(s)=\frac{s(s+2)}{s^{2}+3 s+1} Find the steady-state response (output) of this system for: (a) Unit step input, (b) Ramp input with a slope of 2 units.