The benzene hold on an oil tanker transiting a lock in the Panama Canal is ruptured by a spar that breaks loose from an on-board derrick. As a result of the spill, a 1-cm thick benzene film forms over the entire water surface of the lock. The volume of affected biota {i. e., aquatic organisms) is estimated as 0.2 m3. The biota-water partition coefficient is 15 cm3 /g and the density of the biota is approximately 1.1 g/ cm3. Determine the anticipated effect of this accident on: a) the concentration of benzene in the air in the immediate vicinity o~ the lock; and, b) the mass of benzene in the biota. State all assumptions.

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.

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