According to Aristotle, which of these is a "natural" or "unforced" motion?
A) A book coming to rest as it slides along the floor.
B) A stone falling straight downward.
C) Both of the above.
D) Neither of the above.
C
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Red giant stars are I. more luminous than the sun. II. larger in diameter than the sun. III. cooler than B stars. IV. located above the main sequence stars in the H-R diagram
a. I & II b. II & IV c. I, II, & IV d. II, III, & IV e. I, II, III, & IV
In a mass spectrometer where ions are fired at a given speed perpendicular to the magnetic field, what would be the ratio r20/r22 of the radii of the paths for singly-ionized neon atoms of masses 20 u and 22 u?
1.100/121 2.10/11 3.11/10 4.121/100
Mercury's average density is about as high as Earth's. This is most likely because
A. it is composed of material blasted off Earth in a collision. B. it is highly compressed by its own gravity. C. unlike Earth, it does not have a (light) atmosphere that lowers its average density. D. it contains a significantly higher fraction of iron than Earth.
Describe one major accomplishment for each of the following people: Copernicus, Tycho Brahe, Kepler, Galileo, Newton
What will be an ideal response?