Four light-emitting diodes (leds) are designated as led0, led1, led2, and led3. these leds
are illuminated by applying a voltage to them corresponding to "logic 1", and darkened by applying a
voltage to them corresponding to logic 0. a computer generates a 4-bit number a = a3a2a1a0. design
and sketch a digital logic circuit that will illuminate led0 when a=0100, led1 when a=0101, led2
when a=0110, and led3 when a=0111. for all other values of a, the leds should be dark. you
may use logic gates and/or decoders for your circuit. clearly label all leds, signal lines, and decoders.
try to minimize the number of components.

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.

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length

Ifa component is made of two or more materials with different modulus of elasticity (e), it is called a composite member and we calculate the factor·n". mention the formula for calculating n". also, ifn> 1, explain what will happen to the 1. transformed.gi) ifn 1, what will happen to the material when transformed material when