As a means of preventing ice formation on the wings of a small, private aircraft, it is proposed that electric resistance heating elements be installed within the wings. To determine representative power requirements, consider nominal flight conditions for which the plane moves at 100 m/s in air that is at a temperature of
Want to see the full answer?
Check out a sample textbook solutionChapter 6 Solutions
Fundamentals of Heat and Mass Transfer
Additional Engineering Textbook Solutions
Engineering Mechanics: Statics
Mechanics of Materials
Mechanics of Materials (10th Edition)
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
Fox and McDonald's Introduction to Fluid Mechanics
Fundamentals Of Thermodynamics
- Nellie and Goldie are coasting on their bicycles down a 10° slope at 15 m/s through still air. The mass of Nellie and her bicycle is 60 kg. The mass of Goldie and her bicycle is 90 kg. The cross-sectional area of Nellie and her bicycle is 0.45, while the cross-sectional area of Goldie and her bicycle is 0.60. The drag coefficient for both cyclists is 0.70. Other than gravity and air resistance, the external forces acting on the two bicycle and rider systems are the same. Which cyclist is more affected by air resistance, and why?arrow_forwardThe air with a temperature of T. 127°C and a speed of U. = 4 m/s flows over the plate with an area of 1 m² and a surface temperature of T = 27°C. The drag force acting on the plate is measured as 24.2 x 103 N. Calculate the heat flow from the air to the plate. Cp 1.009 kJ/(kg.K) Pr= 0.708arrow_forwardA plane of mass 3000 kg is in level flight at a speed of 300 km/hr with the wings set at an angle of incidence of 3 degrees. If a sharp-edged vertical gust hits the plane with a speed of 30 km/hr, what is the load factor for the plane?arrow_forward
- The passenger compartment of a minivan traveling at 50 mi/h in ambient air at 1 atm and 80°F is modeled as a 4.5-ft-high, 6-ft-wide, and 11-ft-long rectangular box. The airflow over the exterior surfaces is assumed to be turbulent because of the intense vibrations involved. Determine the drag force acting on the top and the two side surfaces of the van and the power required to overcome it.arrow_forwardWhat is the effect of weight on maximum endurance and maximum range? What happens to maximum endurance and maximum range airspeed when weight is increased?arrow_forwardA horizontal axis wind turbine with a 20-m diameter rotor is 30% efficient at 10 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 top of a mountain at an elevation of 2500 m at 10° 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. Is it beneficial to build the turbine on top of the mountain? Explain your answer.arrow_forward
- The drag coefficient for the car is CD�� = 0.28, and the projected area into the 20∘C∘C airstream is 2.5 m2m2. At this temperature ρa�� = 1.202 kg/m3kg/m3. (Figure 1)Determine the power the engine must supply to maintain a constant speed of V� = 160 km/hkm/h .arrow_forwardA 17,000-kg tractor-trailer rig has a frontal area of 9.2 m2, a drag coefficient of 0.96, a rolling resistance coefficient of 0.05 (multiplying the weight of a vehicle by the rolling resistance coefficient gives the rolling resistance), a bearing friction resistance of 350 N, and a maximum speed of 110 km/h on a level road during steady cruising in calm weather with an air density of 1.25 kg/m3. Now a fairing is installed to the front of the rig to suppress separation and to streamline the flow to the top surface, and the drag coefficient is reduced to 0.76. Determine the maximum speed of the rig with the fairing.arrow_forwardWater at 10°C flows over a 4.8-m-long flat plate with a velocity of 1.15 m/s. If the width of the plate is 6.5 m, calculate the average friction coefficient over the entire plate. (Water properties at 10°C are: ? = 999.7 kg/m3, ? = 1.307 × 10−3 kg/m·s.) (a) 0.00288 (b) 0.00295 (c) 0.00309 (d ) 0.00302 (e) 0.00315arrow_forward
- A small aircraft has a wing area of 37 m2, a lift coefficient of 0.45 at takeoff settings, and a total mass of 4300 kg. Determine the following: The takeoff speed of this aircraft at sea level at standard atmospheric conditions The wing loading The required power to maintain a constant cruising speed of 300 km/h for a cruising drag coefficient of 0.036arrow_forwardA submarine can be treated as an ellipsoid with a diameter of 5 m and a length of 25 m. Determine the power required for this submarine to cruise horizontally and steadily at 40 km/h in seawater whose density is 1025 kg/m3. Also determine the power required to tow this submarine in air whose density is 1.30 kg/m3. Assume the flow is turbulent in both cases.arrow_forwardThe oil tanker has a smooth surface area of 4.7(1033) m2m2 in contact with the sea. The velocity of the ship is 2 m/sm/s. Suppose that L� = 350 mm . Take ρ� = 1030 kg/m3kg/m3 and μ� = 1.14(10−3−3) N⋅s/m2N⋅s/m2. ( Determine the friction drag on its hull. Express your answer to three significant figures and include the appropriate units. Determine the power required to overcome this force. Express your answer to three significant figures and include the appropriate units.arrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY