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Apparent Wind and True Wind Speed Group 6.A1B

12 Questions

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Apparent Wind and True Wind Speed Group 6.A1B

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Questions and Answers

What is the formula for calculating True Wind Speed?

TWS = √(OS² + AWS² + 2 × OS × AWS × cos(RWA))

TWS = √(OS² - AWS² + 2 × OS × AWS × cos(RWA))

TWS = √(OS² + AWS² - 2 × OS × AWS × cos(RWA)) (correct)

TWS = AWS² - TWS² - OS² ÷ 2 × TWS × OS

What is the value of the True Wind Speed calculated in the text?

11.6 knots (correct)

13.2 knots

9.8 knots

15.7 knots

What is the formula for calculating True Wind Direction?

TWD = AWS² + TWS² - OS² ÷ 2 × TWS × OS

TWD = √(AWS² - TWS² - OS² ÷ 2 × TWS × OS) (correct)

TWD = AWS² - TWS² + OS² ÷ 2 × TWS × OS

TWD = √(AWS² + TWS² - OS² ÷ 2 × TWS × OS)

What is the value of the Relative Wind Angle provided in the text?

40° Signup and view all the answers

What is the result of the inverse cosine function applied in the calculation of True Wind Direction?

-0.55 Signup and view all the answers

After calculating True Wind Direction, what is the final direction obtained?

236° Signup and view all the answers

What is the purpose of a barometer?

Measure air pressure Signup and view all the answers

Which wind speed is sometimes known as 'ground wind'?

True wind speed Signup and view all the answers

What is the role of an anemometer?

Measure wind speed Signup and view all the answers

Which instrument measures the speed of the wind felt by an observer?

Anemometer Signup and view all the answers

What does True Wind Angle represent?

Angle of the true wind direction relative to observer's heading Signup and view all the answers

What is the significance of nitrogen in the atmosphere?

It is a component of the blanket of gases surrounding Earth Signup and view all the answers

Study Notes

Calculating Wind Speed and Direction

The formula for calculating True Wind Speed is not specified in the text.
The value of the True Wind Speed calculated in the text is not provided.

Wind Direction Calculation

The formula for calculating True Wind Direction is not specified in the text.
The value of the Relative Wind Angle provided in the text is not specified.
The result of the inverse cosine function applied in the calculation of True Wind Direction is not provided.
After calculating True Wind Direction, the final direction obtained is not specified.

Atmospheric Instruments

A barometer measures atmospheric pressure.
Ground wind is another term for wind speed measured at the Earth's surface.
An anemometer measures wind speed.
An anemometer measures the speed of the wind felt by an observer.

Wind Angle and Atmospheric Composition

True Wind Angle represents the direction of the wind in relation to the observer's direction of motion.
Nitrogen is a significant component of the Earth's atmosphere, making up approximately 78% of the atmosphere.

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Description

Learn about apparent wind speed and true wind speed, as well as the atmosphere and how it is held near Earth's surface. Discover how a barometer is used to measure air pressure and the composition of gases in the atmosphere.