According to the nebular theory, what are asteroids and comets?
A) They are the shattered remains of collisions between planets.
B) They are the shattered remains of collisions between moons.
C) They are leftover planetesimals that never accreted into planets.
D) They are chunks of rock or ice that condensed long after the planets and moons had formed.
E) They are chunks of rock or ice that were expelled from planets by volcanoes.
C
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Addition by Components: You walk 53 m to the north, then you turn 60° to your right and walk another 45 m. Use components to determine the direction of your displacement vector. Express your answer as an angle relative to east.
A. 63° N of E B. 50° N of E C. 57° N of E D. 69° N of E
Which of the following statements about scientific theories is not true?
A) A theory can never be proved beyond all doubt; we can only hope to collect more and more evidence that might support it. B) A theory cannot be taken seriously by scientists if it contradicts other theories developed by scientists over the past several hundred years. C) A theory is a model designed to explain a number of observed facts. D) A theory must make predictions that can be checked by observation or experiment. E) If even a single new fact is discovered that contradicts what we expect according to a particular theory, then the theory must be revised or discarded.
A fancy sports car passes Big Ben at a speed of 0.600c. What time interval will the driver measure for a one-second interval on the large clock?
a. 1.67 s b. 0.800 s c. 1.25 s d. 0.600 s e. 1.00 s
Four different main-sequence stars are colored blue, orange, red, and yellow. What is their rank from coolest to hottest?
A) red, yellow, orange, blue B) blue, yellow, orange, red C) red, orange, yellow, blue D) orange, blue, yellow, red