As illustrated in Video V7.9, models are commonly used to study the dispersion of a gaseous pollutant from an exhaust stack located near a building complex. Similarity requirements for the pollutant source involve the following independent variables: the stack gas speed, V, the wind speed, U, the density of the atmospheric air, rho, the difference in densities between the air and the stack gas, rho - rho_s, the acceleration of gravity, g, the kinematic viscosity of the stack gas, V_s, and the stack diameter, D. (A) Find 4 pi groups for modeling the pollutant source and choose the correct answer below. a) pi_1 = V/v_s, pi_2 = VD/U, pi_3 = V/gD, pi_4 = rho - rho_s/rho b) pi_1 = D/U, pi_2 = Vg/v_s, pi_3 = v_s/rhoD, pi_4 = v_s/rho - rho_s c) pi_1 = V/U, pi_2 = VD/v_s, pi_3 = V^2/gD, pi_4 = rho - rho_s/rho d) pi_1 = U/V, pi_2 = V/v_sD, pi_3 = V^2/g, pi_4 = rho - rho_s/v_s (B) For this type of model a typical length scale might be 1:200. If the same fluids were used in model and prototype, would the similarity requirements be satisfied?

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

i believe the answer is a hope it and is correct

the tires are rotating at 0.434 rpmlinear speed=45 m/sdiameter=0.550 mradius=0.275 mnow v= rωω= v/rω=45/0.275ω=163.6 rad/sω=163.6 rad/s (1rev/2π rad) (60s/1m)ω=1563 rpm