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The yearly average solar flux incident on a horizontal surface in the United States is about 180 W/m2. The average total energy demand in the United States is approximately 100 quads (100 × 1018 J) per year. Assuming an average efficiency of PV cells of 14% and a biomass conversion efficiency around 1%, estimate the percentage of land required to provide the energy of the country by these two renewable technologies. (The total land area of the United States is about 9.2 × 106 km2.)
Explain the answer in a manner such that someone who did not previously know the answer will now understand the concept down to the microscopic level (i.e., basic bonding and atomic models).
Explain what will happen to the fertilizer concentrate in the container below as the metering valve is opened.
Determine the nature and magnitude of the damping force and the frequency of the damped vibration.
steam enters an adiabatic turbine at 5 mpa and 450 c and leaves at a pressure of 1.4 mpa.determine the work output of
Steam leaves the turbine at a pressure of 1 bar. The turbine is adiabatic and kinetic and potential energy changes are negligible. If the isentropic turbine efficiency is 75%, determine the work per unit mass flow in KJ/kg, and plot on an h-s diagram..
bone cement used by orthopedic surgeons to set artificial hip implants in place is methyl methacrylate polymerized
air at 14.7 psia and 70 degrees farenheit is compressed adiabatically by a centrifugal compressor to a pressure of 100
Half a kilogram of nitrogen, initially at 350K and 200Kpa is compressed through a poly tropic process with pv^1.4= constant. If the final temperature is measured to be 400K, find the work in the process.
helium is contained in a cylinder and expands frictionlessly against a piston so that pv constant. initially the
estimate the convective heat-transfer coefficient for natural convection from a horizontal steam pipe. the outside
Water flows into a sink as shown in Fig. at a rate of 2 gallons per minute. Determine the average velocity through each of the three 0.4-in.-diameter overflow holes if the drain is closed and the water level in the sink remains constant.
why do you think it is important to control the position of a dc motor? provide two examples for position control of
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