An Astronaut in an Orbiting Space-Craft Feels "Weightless" Because She

question 47

Multiple Choice

An astronaut in an orbiting space-craft feels "weightless" because she:

• A)is beyond the range of gravity
• B)is pulled outwards by centrifugal force
• C)has no acceleration
• D)has the same acceleration as the space-craft
• E)is outside Earth's atmosphere

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Definitions:

Known Minerals

Refers to substances with a definite chemical composition and crystalline structure that have been identified and cataloged by scientists.

Silicon Tetrahedron

A fundamental structural unit in silicate minerals, consisting of four oxygen atoms symmetrically arranged around a central silicon atom.

Cleavage

The tendency of a mineral to break along flat, smooth surfaces, which is related to the mineral’s crystal structure.

Silicate Minerals

Minerals that contain silicon and oxygen, and usually one or more additional elements, making up the largest and most important class of rock-forming minerals.