Insulated concrete forms (ICFs) are becoming more and more common for a variety of reasons including the desire to build more energy efficient "green" structures. Instead of using temporary forms like lumber to hold poured concrete in place until it has cured, an ICF is essentially a rigid lightweight foam container for a poured wall that is left in place permanently, providing an added layer of insulation. See the basic layout of the system in Fig. 4.56. The form, of course, needs to provide adequate strength to contain the wet concrete (sg =
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Applied Fluid Mechanics (7th Edition)
- Aircraft Fuselage Aircraft Hull Figure 3 a) Consider two large hull as in Figure 3 above made of foam for Amphibian Aircraft has a volume of 80 m3 each, and the total mass of the aircraft when empty is 7000 kg. Determine how much luggage this Amphibian Aircraft can carry without sinking when landing (i) in the lake which have fresh water and (ii) in seawater with a specific gravity of 1.03. b) Please analyse and give the recommendation on the stability of the aircraft when landing in the water if the luggage compartment has been fully filled. The luggage compartment has been located at the centre of the aircraft fuselage. Hìnt: Draw locations of centre of gravity (CG) and centre of buoyancy (CB) to support your answer.arrow_forwardA alank of wood is fixed to a wall using a hinge. When the angle between the plank and the wall is 45°, a spring is attached to the wood 25cm from the hinge and fixed to the wall so that it is horizontal (Diagram A). The wood is then pushed downwards until it is perpendicular to the wall (Diagram B). The force exerted by the spring, depends on its length. As the spring stretches, the force it exerts increases. A graph showing this relationship is below. 70 Diagram B 60 Diagram A spring 50 90° 20 25cm 45 90° 10 25cm hinge 10 35 15 20 25 30 Spring Length (cm) (a) Calculate the length of the spring in Diagrams A and B. (b) Calculate the torque produced by the spring on the plank of compare the values. around the hinge in 4 oth Diagrams A and B and Force (N)arrow_forwardQuestion 3 Utilizing high thermal mass materials for building envelopes can: O Reduce heat exchange between indoor and outdoor Save more energy if outside temperature swing is large. O be different upon the thickness or mass even if it is for same materials O Be combined with Trombe Wallsarrow_forward
- please help me answer this question. I really need the answer. Thank you so much!arrow_forwardQ2: A fiberglass composite consists of a matrix of vinyl ester and reinforcing fibers of E-glass. The volume fraction of E-glass is 30%. The density of the vinyl estiser 0.882 g/cm³, and its modulus of elasticity is 3.6 GPa. The density of E-glass is 2.6 g/cm³, and its modulus of elasticity is 76 GPa. A section of composite 1 cm by 25 cm by 2 m is fabricated with the E-glass fibers running longitudinally in the 2000 mm direction. Determine: (a) The masses of vinyl ester and E-glass fibers. (b) The density of the composite. (c) The composite modulus of elasticity in the longitudinal and the perpendicular directions of the glass fibers. (d) If the tensile strength of the glass fibers, is 1 GPA and the tensile strength of the epoxy matrix is 60 MPa, find the tensile strength of the composite in the longitudinal direction.arrow_forwardThe weight of a star is usually balanced by two forces: the gravitational force, acting inward, and the force created by nuclear reaction, acting outward. Over a long period of time, the force due to nuclear reactions gets weaker, causing the gravitational collapse of the star and crushing atoms out of existence. Under such extreme conditions, protons and electrons are squeezed to form neutrons, giving birth to a neutron star. Neutron stars are massively heavy - a teaspoon of the substance of a neutron star would weigh 100 million metric tons on the Earth. a) Consider a neutron star whose mass is twice the mass of the Sun and whose radius is 13.3 km. (The mass of the Sun is 1.99-1030 kg.) If it rotates with a period of 2.57 s, what is the speed of a point on the Equator of this star? Submit Answer Tries 0/99 b) What is the value of g at the surface of this star? Submit Answer Tries 0/99 c) Compare the weight of a 1.30-kg mass on the Earth with its weight on the neutron star. How many…arrow_forward
- INTRODUCTION: for (HEAT TRANSFER THROUGH COMPOSITE WALLS) PROCEDURE: for (HEAT TRANSFER THROUGH COMPOSITE WALLS)arrow_forwardWhat is a gravity wall and what is it's difference from a cantilevered wall?arrow_forward:>> Develop the lateral surface of a hexagonal prism of base edge 20mm and axis height of 50mm restingon its base on HP such that its one base edge is parallel to VP.arrow_forward
- To 8. Ti 1. 2. 3. 4" Common Brick 1/2" OSB Sheathing 3-1/2" x 1-1/2" (2x4) Yellow Pine Studding placed on 16" center 4. 5. 3-1/2" Figerglass Insulation 1/2" Drywall A wall of a house as shown in the accompanying sketch is 10 ft. high and 30 ft. long and has no windows. The outside heat transfer coefficient, h., is 6.0 Btu/hr ft2°F and the inside convective heat transfer coefficient hi is 1.45 Btu/hr ft2°F. 6. Calculate the heat loss through the wall if the house is heated such that the room air temperature, Ti, is 70°F on a day when the outside air temperature, T., is 0°F. State all assumptions and list the thermal resistances and thermal conductivities for 3 each selection of the wall. 7. For this problem, what would be the value of the overall heat transfer coefficient, U? Ans: U = 0.056 Btu/hr ft2ºF You are asked to design a metal hot dog holder for roasting hot dogs over an open campfire. The holder is to be designed such that while the end holding the hot dog becomes cherry red…arrow_forwardP2. Design a cylindrical thin-wall composite fuselage for storing compressed natural gas at a maximum operating pressure of 20 MPa. The pressure vessel is made by filament winding with fibres at ±45 degrees and is required to sustain three times the operating pressure without failure. The radius of the cylindrical pressure vessel must be 0.25 meters, and the length must be 2 meters. The maximum strengths of the composite ply are equal to 2000 MPa in the fibre direction and zero perpendicular to the fibre direction. Determine the minimum number of composite plies required to meet the design requirements. Hoop stress and longitudinal stress of cylinder are Answers: 38 plies (when tp=1 mm) t pr 21arrow_forward(6) There are many kinds of polyethylene foam, each with different properties. The low density polyethylene foams (as seen in this video) are very flexible. Remember: in solid mechanics, "flexible" just means that in comparison to other materials, the material deforms quite a bit, relative to the stress. For torsion, the material property that relates to stiffness is the shear modulus (or modulus of rigidity), G. We'll say that G = 6 MPa. a) Complete the FBD. b) Compute the shear stress at Point B. c) Illustrate it on a stress element. d) Report the shear strain at B (in radians). e) Compute the rotation of the top plane. f) Compute arc length s. FBD: I T=2 kN-m POINT B 18 300mm 1marrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage LearningRefrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning