An Astronaut in a Space Suit Is Motionless in Outer

question 70

Multiple Choice

An astronaut in a space suit is motionless in outer space. The propulsion unit strapped to her back ejects some gas with a velocity of magnitude 50 m/s. The astronaut recoils with a velocity of 1.0 m/s in the opposite direction. If the mass of the astronaut and space suit after the gas is ejected is 120 kg, the mass of the gas ejected is

• A) 1.0 kg.
• B) 1.9 kg.
• C) 2.4 kg.
• D) 3.0 kg.
• E) 3.6 kg.

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Definitions:

Round

To adjust a number to a desired degree of precision, usually to a nearby value that is easier to work with or understand.

Markup

The sum included in the purchase price of products to account for overhead expenses and gain profit.

Inequalities

Mathematical statements that compare two expressions using inequality symbols, showing if one is less than, greater than, or not equal to the other.

Equivalent

Two expressions that have the same value or represent the same mathematical quantity.