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f the sun subtends a solid angle (omega) on the sky, and the flux from the Sun just above the Earth's atmosphere, integrated over all wavelengths, is F(d) show that the flux at the solar photosphere i
If a wire carries a flowing bunch of charges, each magnitude q, and if the wire rests in a magnetic field B , then each charge feels a Lorentz force F = qv B . The wire is bendy and B and I could vary
Calculate the energy content of 1 kg of natural uranium assuming complete fission. Estimate an average energy per fission. Compare this to the energy in 1 kg of coa
Consider a wide-gap degenerate n-type semiconductor with a bandgap of Eg=3.5 eV. Given a constant effective mass Mn*=0.2 m in the entire conduction band.calculate the absorption threshold in terms of
n = 6 moles of a monatomic ideal gas initially fills a V0 = 0.35 m3 container at P0 = 85 kPa. The gas undergoes an isobaric expansion to V1 = 1.3 m3. Next it undergoes an isovolumetric cooling to its
Calculate the energy content of 1 kg of natural uranium assuming complete fission. Estimate an average energy per fission. Compare this to the energy in 1 kg of coal (reference all values assumed). Wh
On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. The acceleration free-fall on the moon is 1/6 of its value on earth. Suppose he hi
If a 1000 MWe (Megawatt electric) reactor operates with a capacity factor of 95% for an 18 month cycle, how much fuel is required for this period if the average burnup of the fuel over several cycles
If a home operates on an average of 1.1 kW electricity, how many fuel pellets of uranium dioxide (UO2) are required to operate the home for 1 year. Assume that each enriched fuel pellet is 10mm in len
Your refrigerator has a mass of 124.7 kg, including the food in it. It is standing in the middle of your kitchen, and you need to move it. The coefficients of static and kinetic friction between the f
coat your cantilever with a layer of receptor molecules, which can bind the pathogen. Each receptor molecule has a molecular weight of 278.1 u, where 1 u = 1.66053886 × 10?27 kg. The receptor mo
A third sample, of mass 5.66 g was burned under different conditions to yield 2.49 g of HNO 3 as the only nitrogen containing product. Calculate the empirical formula of the compound.
Lead is found in Earth's crust as several different lead ores. Suppose a certain rock is composed of 38.0% PbS(galena), 25.0% PbCO 3 (cerussite), and 17.4% PbSO 4(anglesite).
Phosphorus is obtained primarily from ores containing calcium phosphate.If a particular ore contains 58.5% calcium phosphate, what minimum mass of the ore must be processed to obtain 1.00 kg
The chloride of an unknown metal is believed to have the formula MCl 3. A 1.891g g sample of the compound is found to contain 3.606×10^-2 mol. Find the atomic mass of M.
The value of mannings roughness coefficient is n= 0.014 and the deischarge per nit width of the channel is q= 3m2/s. Specify if the flow in the cahnnel is sub or supercritical and find the depth and
A cast-iron cylinder of 300mm bore carries a pressure of 30 Newtons per square millimetre; what should be its thickness for a unit working stress of 25 newtons per square millimetre?
Given that the internal energy of water at 55 bar pressure is 1178 kJ kg-1. calculate the specific enthalpy of water at 55 bar pressure.
Sketch on a T - s diagram the following cycle for a gas turbine: Isentropic expansion through turbine 1 from pressure p1 down to intermediate pressure p3
the turbine at apressure of 3 bar for process heating. If the condensate from the processheater is directly pumped back to the boiler, find: the power output from the turbine.
If the condenser pressure is 0.03 bar, find the thermal efficiency of the cycle. Neglect feed pump work. If the is entropic efficiency of the steam turbine in part (a) above is 0.82, find: thermal eff
The specific volume of water at this pressure is 0.13 × 10-2 m3 kg-1, calculate the specific enthalpy of water at 55 bar pressure.
The population of a mosquito colony in a certain region experience unihibited exponential growth. The initial population of mosquitoes is 100. After 4 day(s), the population has grown to 400. What
Describe the structure and function of the forelimbs and hind limbs of the frog.
In 2008, the Food and Drug Administration (FDA) approved food derived from cloned animals. Is your opinion of eating a cloned plant different?