When Copernicus first created his Sun-centered model of the universe, it did not lead to substantially better predictions of planetary positions than the Ptolemaic model. Why not?
A) Copernicus used perfect circles for the orbits of the planets, though they are actually ellipses.
B) Copernicus placed the planets in the wrong order going outward from the Sun.
C) Copernicus misjudged the distances between the planets.
D) Copernicus placed the Sun at the center, but did not realize that the Moon orbits Earth.
A
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A gas is confined to a cylindrical container of radius 1 cm and length 1 m. The pressure exerted on an end face, compared with the pressure exerted on the long curved face, is:
A. smaller because its area is smaller B. smaller because most molecules cannot traverse the length of the cylinder without undergoing collisions C. larger because the face is flat D. larger because the molecules have a greater distance in which to accelerate before they strike the face E. none of these
If F = 5.0 N, what is the magnitude of the force exerted by block 2 on block 1?
A. 17 N B. 19 N C. 21 N D. 23 N E. 5.0 N
Does a magnetic field exert a force on a stationary object?
1.yes 2.no
Explain how the pulse-echo technique works for medical imaging
What will be an ideal response?