4: Rafiq has 4 parking spaces in the basement of his apartment. Now, he wants to know when two adjacent space are open as he doesn't not want anyone to park next to his brand-new car. Rafiq already set up a pressure switches in the parking space to detect if the space is occupied or not and also has 4 logic indicators outside his building. He wants one logic indicator to activate if two adjacent space become open, another logic indicator to active if three space become open, a third if all spaces are open and a fourth if one space is open (in case he chooses to risk it).

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

In general, how do thermosetting plastics compare to thermoplastics in mechanical and physical properties?

What is the major difference between thermoplastics and thermosetting plastics from the polymerization structure point of view?