Process of Science: Why did astronomers identify Pluto as a planet from its discovery? What scientific evidence led to its reclassification?
What will be an ideal response?
Pluto was a large object in the solar system, and not near the asteroid belt, so it was regarded as a planet. New evidence contradicting this classification included the discovery of the Kuiper Belt, in particular the discovery of other large KBOs.
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A ball is thrown at an angle ? above the horizontal. In the presence of the acceleration due to gravity, how far below the straight-line path following its original direction of motion will the ball be at the end of 1.0 second?
A) 20 m B) 4.9 m C) 9.8 m D) 2.5 m E) None of the other choices is correct.
The energy levels of electrons in atoms are ______________, which means that only certain values of energy are allowed
Fill in the blank(s) with correct word
Which of these is NOT true about the early Arab practice of alchemy?
a. Alchemists were looking for the secrets of eternal life and how to turn inexpensive materials into gold. b. Alchemists were early experimental scientists and observers. c. Alchemy was pseudoscience, rather than involving any form of research. d. Alchemists were important predecessors of modern chemists. e. Alchemists studied materials and how they changed.
All real engines are less efficient than the Carnot engine because
a. they do not operate through the Otto cycle. b. they do not operate through a reversible cycle. c. the working substance does not maintain a constant volume through the cycle. d. the working substance does not maintain a constant pressure through the cycle. e. the working substance does not maintain a constant temperature through the cycle.