Who is credited with the origins of scientific thought?
What will be an ideal response?
Thales
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The planet Mars reaches its closest point to the Earth approximately every
A) 26 months B) 12 months C) 6 months D) 36 months
Why does Ptolemy include epicycles in his model?
What will be an ideal response?
Two objects are thrown from the top of a tall building and experience no appreciable air resistance. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street?
A) The one thrown up is traveling faster. B) The one thrown down is traveling faster. C) They are traveling at the same speed.
Characteristic x-rays can be produced by bombarding targets with electrons. These x-rays occur when
a. electrons from higher shells fill the vacant lower shell b. electrons fill the vacant valence shell c. photons are emitted with energies on the order of 103 eV d. photons are emitted with wavelengths on the order of 103 nm