To say that an object is moving at constant velocity means that it is

1) at rest,
2) moving at an unchanging speed,
3) moving at an unchanging speed in a straight-line path,

and that its acceleration is
4) zero.
5) constantly increasing (or decreasing).
6) uniform.


Answer: 3, 4

Physics & Space Science

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The correct sequence of spectral type letters from hot on the left to cool on the right is

a. M, K, G, F, A, B, O b. O, B, A, F, G, K, M c. G, K, M, F, O, B, A d. A, B, O, F, G, K, M

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Main-sequence stars have about the same density as the Sun but giant stars have very low densities

a. True b. False Indicate whether the statement is true or false

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For the lead-tin phase diagram in Figure 5.11a,

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The symbol G is used to represent

a. the acceleration of gravity. b. the universal gravitational constant. c. grams. d. gravity. e. none of the above.

Physics & Space Science