A car moves in a straight line such that for a short time its velocity is defined by v= (3t^2 + 2t) bels, where t is in seconds. Determine its position and
acceleration when t = 3 s. When t=0;S=0.

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 higher the astm grain size number, the finer the gran is. a)-true b)-false

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false