The Ptolemaic model of the universe
A) explained and predicted the motions of the planets with deferents and epicycles.
B) is the basis of our modern cosmology.
C) could not account for the stellar parallax observed by Hipparchus.
D) describes the orbits of the planets as being ellipses, not circles.
E) always kept Mars and Mercury between the Earth and Sun.
A
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An object moves with speed vx = +0.9 in the Home Frame. In an Other Frame moving at ? = 0.60 relative to the Home Frame, the object’s x-velocity v?x is
A. v?x = 1.5 B. 1 < v?x < 1.5 C. 0.9 < v?x < 1 D. 0.3 < v?x < 0.9 E. v?x < 0.3 F. v?x < 0
A neutral hollow spherical conducting shell of inner radius 1.00 cm and outer radius 3.00 cm has a +2.00-µC point charge placed at its center. Find the surface charge density (a) on the inner surface of the shell. (b) on the outer surface of the shell
What will be an ideal response?
The heaviest nuclei of all are formed
A) in the horizontal branch. B) in dense white dwarfs. C) during nova explosions. D) in the ejection of matter in the planetary nebula. E) in the core collapse that set the stage of Type II supernovae.
A hose has been clamped so that the area at the clamp is only one quarter the area of the rest of the hose. When we ignore the viscosity of water, the ratio of the speed of the water through the clamped area to the speed of the water when it leaves the hose is
A.
.B.
.C.
D.
E.