Consider an air mass of temperature of 30°C and relative humidity 60% rising from sea surface (1000 mb) to 8 km in the (standard) atmosphere (pressure decreases with altitude approximately 100mb per kilometer, temperature lapse rate 6.5K km-?). Find the height of cloud-base where air temperature is equal to dew-point temperature. If the conversion efficiency of water vapor in the clouds to precipitation is 5%, and the convection lasts 2 hours with average updraft velocities of 1 m s', what would be the total precipitation?

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 air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.