PPL Air Tech Defs, Atmosphere

What is the gravitational force?

• The force wanting to accelerate an object towards its center

• The amount of matter in an object

• How much force a moving object has

• Force produced when a mass is attracted by Earth's gravity

A Scalar....

• Has direction and velocity

• Has direction and magnitude

• Has direction only

• Has only magnitude

What is the equation for Work?

• W= Force x Time

• W= Force x Distance

• W= Time x Effort

• W= Distance x Speed

The SI and ICAO units for distance are....

• Feet & Km

• Meters & Km

• Feet & Nm

• Meters & Nm

What is the percentage of Oxygen in the atmosphere?

• 78%

• 23%

• 21%

• 22%

What two properties affect density?

• Temperature

• Pressure

• Airflow

• Speed

A more dense atmosphere means more molecules in that parcel

• True

• False

What happens to pressure, temperature and density with a gain in altitude in the troposphere?

• They all increase
• Pressure increases, temperature and density decrease
• Pressure and temperature increase, density stays the same
• They all decrease

The pressure lapse rate is....

• 30 hPa per 1ft

• 1 hPa per 30ft

• 5 hPa per 30ft

• 25 hPa per 5ft

At 10,000ft pressure and density are reduced to __% that of Sea Level

• 33%

• 25%

• 50%

• 75%