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
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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)
We can see most of the Milky Way with visible light
Indicate whether the statement is true or false
The mineral that is most abundant in Earth's crust is
a. quartz. b. feldspar. c. calcite. d. pyrite.
Consider a small satellite moving in a circular orbit (radius r) about a spherical planet (mass M). The period does not depend upon
A) g at the satellite position. B) the planet mass. C) the satellite mass. D) the radius r. E) the universal gravitational constant.