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