Agas flows through a pipe of 0.08 m inside diameter at a velocity of 2.2 m/s. calculate the heat transfer coefficient h, for the gas on the inside of the pipe wall if the dittus-boelter equation can be used nu = 0.023reo. pr0.4. the prandt number for the fluid is 1.8, its density is 5.8 kg/m", the viscosity is 1.158 x 10 pa s, and the thermal conductivity is 0.02 w/m².k. a) 66 w/m².k b) 1052 w/m²k c) 263 w/m²k d) 88 w/m²k e) 12 w/m²k

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

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 characteristic roots of a dynamic system are: 1.7920 1.8160 i, -1.7920 1.8160 i, -0.4160 what is the order of this system? what are the settling time and damping ratio of the system?