Astandard bod test is run using seeded dilution water. in one bottle, the waste sample is mixed with seeded dilution water given a dilution of 1: 30. another bottle, the blank, contains just seeded dilution water. both bottles begin the test with do at the saturation value of 9.2 mg/l. after five days, the bottle containing waste has do equal to 2.0 mg/l, while that containing just seeded dilution waterhas a do equal to 8.0 mg/l. find the five-day bod (mg/l

Which of the following is an easy way to remember the modified “x” tire rotation? a. nondrive wheels straight, cross the drive wheels b. drive wheels straight, cross the nondrive wheels c. drive wheels crossed, nondrive wheels straight d. drive wheels crossed, nondrive wheels crossed

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.

Fluids at rest possess no flow energy. a)- true b)- false