A 4 m thick steel plate initially at 225 °C. Suddenly, both surfaces are exposed to an ambient at 25 °C with a heat transfer coefficient h = 500 W/m²K.What is the temperature at depth 1 cm from the surface at t = 2 minutes after the start of the cooling? For steel: k = 20 W/mK, a = 16x10-6 m²/s. Lütfen birini seçin: A. 51.13 °C B. 43.14 °C C. 60.10 °C D. 52.60 °C

Calculate the pressure range for the given bubbler? A = 5 cm, B = Max Level = 1 m, S.G. = 1.4 Blank #1: Min = Blank #2: Max = cmWC cmWC

EX in Asteel of speçific weight cy lin der (1"diametar andiz" Long) (8) =490 1b fI Ft3 fall be Cause of its own weight, at q uniform slig htly 9. rate of on5 HIs in side a tube of larger diameter.A Castor- oil film M = 6x lo -3 16 between t-s Constant thihness and the tube between of %3D is the cylinder Determine the cleamanCe (y) in ft the Cylinder and the tube-

to stop bleeding of capillary, which better tools material the one has higher thermal conductivity k or the one has a lower thermal conductivity? and why ?

Water is flowing in a round tube. The temperature is . , and the dynamic viscosity is . The tube inside diameter is  .  The Reynolds number is . What is the friction factor? ____________

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A class A pan was set up adjacent to a lake. The depth of water in the pan at the begin- ning of a certain week was 195 mm. In that week there was a rainfall of 45 mm and 15 mm of water was removed from the pan to keep the water level within the specified depth range. If the depth of the water in the pan at the end of the week was 190 mm calculate the pan evaporation. Using a suitable pan coefficient estimate the lake evapo- ration in that week.

Working for an engineering consultancy firm, your knowledge of fluid dynamics is required to design a new safety feature for a high-pressure air line in a factory. The air line takes the form of a cylindrical pipe of diameter 150 mm, which is designed to operate between 0.45 MPa and 0.76 MPa. At the end of the pipe a burs9ng disk is placed so that, if the pressure exceeds the maximum opera9ng pressure, the air is vented to atmosphere rather than over-pressuring the chemical reac9on vessel (Figures 4a and 4b). In this ques9on, you should treat the flow as quasione-dimensional and inviscid. The air in the surrounding atmosphere is at 101 kPa and 298 K. a) You have a choice of five disks which can withstand the following forces across them before burs9ng: 10.5 kN, 11.0 kN, 11.5 kN, 12.0 kN, 12.5 kN. Which of these burs9ng disks would you recommend, and why? b) Due to an over-pressurisa9on of the air line, the disk bursts at 9me t = 0. At what pressure in the air line will this occur? c)…

What are the disadvantage of internal floating roof tank?

As an engineering student, your community has asked you to assist an architect in designing a building fit for winter and summer. Apply your knowledge of mechanical engineering science (Thermofluid) in the design.  Kindly include the following:i. Specify the type of building (domestic or community centre)ii. Specify the capacity of the water (in volume) for the buildingiii. Include the vapour compression refrigeration cycle componentsiv. Suggest and discuss the source (s) of energy for the buildingv. Discuss the possible type of fuel to be used and give a reason for the usagevi. Include a sketch with key components