The principle of equivalence tells us that

A) mass and energy are forms of each other.
B) space and time are forms of each other.
C) electricity and magnetism are forms of each other.
D) observations made in an accelerating reference frame are indistinguishable from those made in a gravitational field.
E) all of the above


Answer: D

Physics & Space Science

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Object A (mA = 1.0 kg) hangs at rest from an ideal string A connected to the ceiling. Object B (mB = 2.0 kg) hangs at rest from an ideal string B connected to object A. The tension on string A is

A. Twice the tension on string B
B. 1.5 times the tension on string B
C. Equal to the tension on string B
D. the tension on string B
E. Other (specify)

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Indicate whether the statement is true or false

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a. quartz. b. feldspar. c. calcite. d. pyrite.

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Consider a small satellite moving in a circular orbit (radius r) about a spherical planet (mass M). The period does not depend upon

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