Define a scheme function (assoc-all keys a-list) where keys is a list of symbols and a-list is an assoc-list. (an assoc-list is a list …) whose elements are two-element lists whose first element is a key and whose second element is the associated value.) assoc-all returns a list of the data associated with elements of keys by a-list. e. g. (assoc-all '(a d c d) '((a apple)(b boy)(c (cat returns (apple dog (cat cow) dog). use map. note that you can't simply use assoc as one of the arguments to map; you need to use a lambda expression.

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

10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.