Apparent Wind and True Wind Speed Group 6.A1B

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12 Questions

What is the formula for calculating True Wind Speed?

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

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

11.6 knots

What is the formula for calculating True Wind Direction?

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

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

40°

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

-0.55

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

236°

What is the purpose of a barometer?

Measure air pressure

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

True wind speed

What is the role of an anemometer?

Measure wind speed

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

Anemometer

What does True Wind Angle represent?

Angle of the true wind direction relative to observer's heading

What is the significance of nitrogen in the atmosphere?

It is a component of the blanket of gases surrounding Earth

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.

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.

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