Problem 2: Question A horizontal axis wind turbine with a 35-m diameter rotor is 40% efficient at 7.5 m/s winds and at 1 atm of pressure and 15° C. (a) How much power would it produce at these conditions? (b) What would the air density be on the peak of Mount Robson in the Rainbow Range which has an elevation of 3954 m at -8.5°C? (c) Determine the power the wind turbine would produce on the mountain with the same wind speed. Assume that the efficiency of the turbine is not affected by density and the coefficient of friction is the same at both altitudes. Is it beneficial to build the turbine on top of this mountain?
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- (b) The Phong illumination model can be expressed by the following: I = kaia + kaia(l ·n) + k,i,(r · v)ª. (i) Describe each term in this equation. You should specify which parts relate to each type of reflectance, and also define each vector and scalar. (ii) What illumination effects are not accounted for by this model?B. A 1.5m dipole transmitting antenna located with its eenter at the origin and radiates RF signal with frequency 0.1GHZ. A second dipole receiving antenna of length 0.75m is placed in such a way that its axis is purallel with first one at distance 400m, the delivered power in the receiving antenna is -38. 92d3. What is the transmitting power in watts from transmitting antenna?Q. No.2 What is the total resistance between point A and ground in below figure for the following conditions? (a) SW1 and SW2 open (c) SW1 open, SW2 closed (b) SW1 closed, SW2 open (d) SW1 and SW2 closed Ao- SWI sW2 sio k 470 k 910 kN
- Problem 1 A beam AB is subjected to several vertical forces as shown. Write a computer program that can be used to determine the magnitude of the resultant of the forces and the distance x C to point C, the point where the line of action of the resultant intersects AB. - X,7 - X2- C A |BA rectangular footing with a length of 2.5m and width of 1.5m, if the the friction angle of the supporting soil is 25; the value of the shape factor (Fqs) related to general bearing capacity equation is: a. 1.181 b. 1.279 O C. 1.322 O d. 1.2334. The outer facing of a room is constructed from 0.75 m thick brick, 25 cm of mortar, 12 cm of limestone (k=0.186 W/mK) and 0.5 m of plaster (0.096 W/mK). Thermal conductivities of mortar and brick are both 0.52 W/mK. Assume that the heat transfer coefficients on the inside (plaster side) and outside (brick side) surfaces of the wall to be 8 and 24 W/(m^2 K), respectively. Calculate the overall coefficient of heat transfer (W/(m^2 K). Show your solution
- Question 3 Part a: For the section shown, determine the: Maximum elastic Moment M Fully plastic moment Mf Shape factor a If loaded about the horizontal axis o, = 250MN/m²; E = 200GN/m² ● Part b: Determine the bending moment necessary to cause yielding to a depth of 10mm from the top and bottom surfaces. If after applying this load it is subsequently removed. What will be the residual stresses which will result at A and B when the load is removed? 10 40 Yielded region 40 Fig. 3a 10 ΝΑ Fig. 3b ΝΑ21. A radio system transmits a 2.4GHz signal at 250mW over a distance of 20m through two antennae with a combined gain of 10dBi. If the noise level is 0.05µW, and the bandwidth of the channel is 250kHz, what is the theoretical maximum capacity of the system?8-33 and 8-35 The figure illustrates the connection of a steel cylinder head to a grade 30 cast-iron pressure vessel using N bolts. A confined gasket seal has an effective sealing diameter D. The cylinder stores gas at a maximum pressure pg. For the specifications given in the table for the specific problem assigned, select a suitable bolt length from the preferred sizes in Table A- 17, then determine the yielding factor of safety n, and the joint separation factor no Problem R C D E F N Pr Bolt grade 8-33 20 mm 100 mm 150 mm 200 mm 10 6 MPa ISO 9.8 M12x1.75 8-35 20 mm 0.8 m 0.9 m 1.1 m 36 550 kPa ISO 10.9 M10 x 1.5
- Note: Answer five question only. 9/3/2023 علي صغير نية QI/A-If a current of 40 A exists for 1 min, how many coulombs and electrons of charge have passed through the wire? B-What is the resistance of a 30 m length of copper wire with a diameter of 0.5mm.the resistivity of copper is 1.72 x 108 22.m?1-17. (a) For a satellite transmitter operating at 20 GHz, a circular-aperture antenna with a two- degree beamwidth is desired. The aperture efficiency is 65%. What should the antenna diameter be to achieve this beamwidth? What is the corresponding gain? (b) Find the diameter of an antenna that will provide a 150-mile diameter spot at the equa- tor within the 3 dB beamwidth if the platform on which the antenna is mounted is a geostationary-orbit satellite. Assume the operating frequency and efficiency of part (a). What is the gain of the antenna? (Geostationary altitude is 35,784 km above the earth's equator.)Design a wide flange W column 8 m in height to support an axial dead load of 1000 kN and a live load of 1200kN in the interior of a building. The column base is rigidly fixed to the footing and the top of the column isrigidly framed to very stiff girders. Assume that bracing is provided to prevent side sway in the weak axis/planeof the column (you don’t have to consider slenderness in this direction), but side sway is not prevented aroundits strong axis. Select an economical W shape.