Viscous drag Study guides, Revision notes & Summaries

Mechanical ASVAB Latest Update (Scored A) force Changes the velocity of an object friction Acts in opposition to motion, causes effort work to be larger than load work equilibrium Net force is zero when velocity is not changing viscous drag Like friction, however increases with speed, varies by shape gravity Causes objects to fall mass Amount of substance weight Force of gravity on a mass lift Caused by higher speed air flow over a lower speed air flow camber When a surface is curved ai...

Viscosity - Answer Refers to the friction between molecules of a liquid or gas, causing the molecules to tend to adhere to each other (cohesion) and in water to a submerged body (adhesion). How is motion in the aquatic environment affected by the water's viscosity? - Answer Water is more viscous than air. This friction between molecules, or water's friction, is what causes resistance to motion when exercising. A combination of the surface area of an object and its speed determines the r...

AEA Water Exam Questions With Verified Answers 2023 Solution Update In the water, the level of exercise is a function of what FIVE factors? - CORRECT ANS - (1) Speed of movements; (2) Rate of change in speed (acceleration); (3) Surface area (frontal resistance) in the direction of the motion; (4) The participant's and the water's inertia; and (5) The number of times you change direction How is motion in the aquatic environment affected by the water's viscosity? - CORRECT ANS -Wate...

"CFD" stands for correct answer: Computational Fluid Dynamics CFD and Computational Aerodynamics are different names for the same thing correct answer: False The four primary steps in the CFD process are (in order) correct answer: geometry modeling, grid generation, flow solution, post processing CFD methods are also known as "low-fidelity methods" correct answer: False CFD techniques may only be used to model air as the working fluid correct answer: False A properly writ...

"CFD" stands for ... correct answer: Computational Fluid Dynamics CFD and Computational Aerodynamics are different names for the same thing (True or False) correct answer: False The four primary steps in the CFD process are correct answer: geometry modeling, grid generation, flow solution, post processing CFD methods are also known as "low-fidelity methods" (True or False) correct answer: False FD techniques may only be used to model air as the working fluid (True or False) c...

Pros and Cons of Experimental correct answer: Pros: -Realistic results for flight conditions in tunnel -Good for finding trends and correlating variables Cons: -Unable to match all real flight conditions (e.g. Mach and Reynolds) -Costly (equipment, manufacturing time) -tunnel corrections -Difficult to measure Pros and Cons of Theoretical correct answer: Pros: -General analytical expressions -Generally easy to use and fast to analyze Cons: -Require significant simplifying as...

Viscosity correct answers Refers to the friction between molecules of a liquid or gas, causing the molecules to tend to adhere to each other (cohesion) and in water to a submerged body (adhesion). How is motion in the aquatic environment affected by the water's viscosity? correct answers Water is more viscous than air. This friction between molecules, or water's friction, is what causes resistance to motion when exercising. A combination of the surface area of an object and its speed determ...

In the water, the level of exercise is a function of what FIVE factors? correct answers (1) Speed of movements; (2) Rate of change in speed (acceleration); (3) Surface area (frontal resistance) in the direction of the motion; (4) The participant's and the water's inertia; and (5) The number of times you change direction How is motion in the aquatic environment affected by the water's viscosity? correct answers Water is more viscous than air. The friction between molecules in water is w...

Define Rectilinear - ANS-Consisting of straight lines Define wave drag - ANS-Component of aerodynamic drag on every part of an aircraft due to the presence of shock waves Why do ICBM's have a blunt nose instead of an aerodynamically favorable pointy nose? - ANS-Although a slender nose would reduce wave drag, it creates more skin friction heating as air molecules are able to directly contact the tip of the missile as it travels at very high speeds (Mach 25). To reduce the amount of hea...

ASE A7 Test Prep – Heating and A/C - Questions, Answers and Explanations Technician A says that the pressure cycling switch is usually located on the accumulator. Technician B says that the refrigerant must be recovered from the system before the switch can be removed. Who is right? A. Technician A only B. Technician B only C. Both A and B D. Neither A or B The pressure cycling switch senses the low-side pressure near the evaporator outlet and is usually found on the accumulator. Technician B ...