Genetically-modified organisms (gmos) are currently being developed for agriculture. currently commercialized gm crops in the u. s. include soy (94%), cotton (90%), canola (90%), sugar beets (95%), corn (88%), and hawaiian papaya (more than 50%). the use of gmo crops can reduce agricultural costs to farmers and provide greater crop-yields, possibly with issues of food shortages. although this sounds great, there is still a lot of controversy around the use of gmos. which of these is a valid argument on why we should not use gmos in our food? a) gmos do not have any nutritional value b) gmo crops are always more expensive to buy c) gmo crops are invasive and take over the habitat of local crops eliminate d) there is not enough research on long-term effects of eating gmos

In a steady-flow steam power plant system, two adiabatic high-pressure and low-pressure turbines ane used to generate power. superheated steam enters the high-pressure turbine at 8 mpa and 550°c. the steam expands in the high-pressure turbine to a saturated vapor at 3 mpa. in order to increase the powe generation of the power plant, another steam turbine working in a lower pressure ranges is deployed. the outlet vapor from the first turbine is heated up at a boiler to the temperature of 500 c at the constant pressure of first turbine's outlet (3 mpa). then, the vapor enters the second turbine and produces extra work. the exit conditions of the second turbine are 5o kpa and 90 percent quality. if the total power output of the power plant is 25 mw, determine a) the mass flow rate of the water (kg/s). b) heat transfer rate in the boiler (mw). (30 points) 3 mpa 00 c 8 mpa s0 c high pres turbine low pres boiler turbine 50 kpa 3 mpa 09 saturated vapor t heat engine, shown in the figure, operates between high temperature and low temperature of through a heat 4. a carnot tn and tu respectively. this heat engine receives energy from a heat reservoir at t exchanger where the heat transferred is proportional to the temperature difference as ? = k (z,-7, ). it rejects heat at a given low temperature tl. to design the heat engine for maximum work output, find the high temperature, th, as a function of tes and t. (15 points) qe