Air Is Flowing Through a Rocket Nozzle

question 20

Multiple Choice

Air is flowing through a rocket nozzle.Inside the rocket the air has a density of 5.25 kg/m³ and a speed of 1.20 m/s.The interior diameter of the rocket is 15.0 cm.At the nozzle exit,the diameter is 2.50 cm and the density is 1.29 kg/m³.What is the speed of the air when it leaves the nozzle?

• A)123 m/s
• B)176 m/s
• C)88.0 m/s
• D)45.7 m/s
• E)29.3 m/s

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Definitions:

Protective Factors

Events or circumstances that help to offset, or buffer, risk factors. Anything that lessens the likelihood of disease. For example, exercise is thought to be a protective factor for cardiovascular disease.

Risk Factors

Events or circumstances that increase the likelihood of later pathology.

Psychopathology

Both the scientific study of psychological abnormality and the problems faced by people who suffer from such disorders.

Resilience

The capacity of people to “bounce back” and cope with stress and catastrophe.