Chapter 4 Flashcards

1
Q

The difference between Pressure Altitude and True Altitude.

A

D-Value

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2
Q

A sudden increase in wind speed by a magnitude of 16Kts or greater to a sustained speed for a period of 1 minute.

A

Squall

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3
Q

Reported when there is at lease a 10Kts variation.

A

Gust

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4
Q

The movement of air that results from differential heating.

A

Thermal Circulation

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5
Q

A VECTOR QUANTITY of wind.

A

Wind Velocity

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6
Q

Wind blow in the counterclockwise direction.

A

Anti-Cyclonic Flow

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7
Q

The force that resists the relative motion of two bodies in contact.

A

Friction

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8
Q

The MAGNITUDES of Wind Velocity.

A

Wind Speed

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9
Q

The resistance of the atmosphere to the relative motion of the aircraft.

A

Drag

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10
Q

The maximum instantaneous wind speed greater than 25Kts since the last hourly observation.

A

Peak Wind Speed

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11
Q

Can only happen when the wind is already blowing.

A

Geostrophic Balance

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12
Q

Produces the centripetal acceleration.

A

Centrifugal Force

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13
Q

Always acts 90 degrees to the right of the wind, looking downstream.

A

Coriolis Force.

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14
Q

The direction FROM which the wind is blowing.

A

Wind Direction

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15
Q

Wind blow in the clockwise direction.

A

Cyclonic Flow

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16
Q

The difference in pressure between two points divided by the distance between the two points.

A

Pressure Gradient Force

17
Q

The resistive force that arises from a skin friction and turbulence near the earth’s surface.

A

Surface Friction

18
Q

A transition zone between large surface frictional effect near the ground and negligible effect about the boundary layer.

A

Boundary Layer