# 24 the definition of momentum is a the quantity of

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24.The definition of momentum is:a.the quantity of mass possessed by a body.b.the quantity of inertia possessed by a body.c.the quantity of motion possessed by a body.d.the opposition which a body offers to a change in velocity.
1Questions125.A force of 24 newtons moves a 10 kg mass 60 metres in 1 minute. The power usedis:1 - 24 watts.2 - 240 watts.3 - force times distance moved in one second.4 - force times the distance the mass is moved in one second.Which of the preceding statements are correct:Questions
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26.When considering momentum:1 - momentum is the quantity of motion possessed by a body.2 - momentum is the tendency of a body to continue in motion after being placedin motion.3 - a mass of 2000 kg moving at 55 m/s has 110 000 kg-m/s of momentum.4 - a large mass moving at 50 m/s will have less momentum than a small massmoving at 50 m/s.The correct combination of statements is:
Answers11AnswersAnswersAircraft number (1)V1speed of 65 knots = 33.5 m/sAircraft number (2)V1speed of 130 knots = 67 m/s
232ChapterThe AtmosphereIntroduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25The Physical Properties of Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25Static Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26Air Density. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26International Standard Atmosphere (ISA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26Dynamic Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27Key Facts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29Measuring Dynamic Pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30Relationships between Airspeeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31Airspeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32Errors and Corrections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32V Speeds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35Answers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
The Atmosphere2242The Atmosphere
225The Atmosphere2The AtmosphereIntroductionThe atmosphere is the medium in which an aircraft operates.It is the properties of theatmosphere, changed by the shape of the wing, that generate the required lift force.The most important property is air density(the “thickness” of air).KEY FACT:If air density decreases, the mass of air flowing over the aircraft in a given time willdecrease.Not usually considered during the study of Principles of Flight, keeping the idea ofmass flow (kg/s) in the ‘back of your mind’ can aid general understanding.A given mass flow will generate the required lift force, but a decrease in air density will reducethe mass flow.To maintain the required lift force if density decreases, the speed of the aircraft through the airmust be increased.The increased speed of airflow over the wing will maintain the mass flowand lift force at its required value.The Physical Properties of AirAir has substance!Air has mass; not very much if compared to other matter, but neverthelessa significant amount.A mass of moving air has considerable kinetic energy;for example,when moving at 100 knots the kinetic energy of air can inflict severe damage to man-madestructures.

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