Two uniform solid spheres have the same mass, but one has twice the radius of the other. The ratio of the larger sphere's moment of inertia about a central axis to that of the smaller sphere is
A) 4/5.
B) 8/5.
C) 1/2.
D) 2.
E) 4.
E
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If Uranus takes 84 years to orbit the Sun, and Voyager 2 found its rings wide open at solstice in 1989, when will or did they next appear edge on, as seen from Earth?
A) 1995 B) 2003 C) 2010 D) 2025 E) They can never appear edge on, due to Uranus' 98 degree axial tilt.
When a jet airplane takes off, how is momentum conserved?
a. Momentum is conserved because the jet of hot air pushes on the atmosphere around it. b. Momentum is conserved because the air rushing out of the jet engine is moving out in the direction opposite to the plane's movement. c. Momentum is not conserved because the jet was motionless and is now moving. d. Momentum is conserved because molecules in the air move on average in all directions. e. Momentum is conserved because the jet is collecting oxygen from the atmosphere.
The first scientist to determine that the orbits of the planets are ellipses was
A. Kepler. B. Newton. C. Ptolemy. D. Copernicus. E. Galileo.
Distilled water at 75ºF is suddenly exposed to oxygen gas at 75ºF. Determine the time before the oxygen concentration in the water is 0.1% by mass at a point 0.05 inches below the surface of the distilled water.
What will be an ideal response?