You are asked to help design a streamlined dirigible with a length of 600 m and a diameter of 100 m to cruise at 15 m/sec for excursions for retired professors. Your task is to estimate the power required for each of four engines assuming 100% efficient propellers. You are allowed to make the crude assumption for calculating the drag that the surface can be represented as one side of a flat plate formed by unwrapping a hollow cylinder with the same length a diameter. You estimate is about: a. 20 horsepower
b. 200 horsepower
c. 2000 horsepower
d. 2 horsepower

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.

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.