Acivil engineer has decided that a parameter termed the "resilient modulus" is central in determining if asphalt roads develop ruts. measurements were made of the resilient modulus on a set of rutted and non-rutted roads. the results from these tests are given below. the units of these measurements are 10^6 kpa and were made at the same temperature(40 degree). using this data perform a hypothesis test to determine if the resilient modulus might be a good parameter to determine road rutting. rutted: 1.48, 1.88, 1.90, 1.23, 1.00 non-rutted: 3.06, 2.58, 1.70, 2.44, 2.03, 1.76, 2.86, 1.04, 2.82.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

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.

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.