Regarding Ptolemy's and Copernicus's theories of astronomy, today we find that
A) both theories are useless because they disagree with the highly accurate measurements available today.
B) Copernicus's theory is correct.
C) Copernicus's theory is still useful, but more accurate theories are available today.
D) both theories are false because we know that Kepler's theory is correct and precisely accurate.
E) Ptolemy's theory is correct.
C
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For a spacecraft going from the earth toward the sun, at what point will the gravitational forces due to the sun and the Earth cancel? [Earth's mass: me = 5.98 × 1024 kg sun's mass: ms = 1.99 × 1030 kg Earth-sun distance: r = 1.50 × 1011 m]
What will be an ideal response?
What is the change of entropy of water (Lf = 0.333 MJ/kg, Lv = 2.26 MJ/kg) when 450. grams of water:
(a) changes from liquid to steam? (b) changes from ice to liquid?
You have a set of 14 metal weights strung together by nylon fishing line at equal intervals. Each has a weight of 0.20 N. You suspend this array from the ceiling and then observe waves travel up and down by shaking it.
The wave seems to move more rapidly at the top, near weights 1-3. This is because
A. gravity is cancelled by tension, so net force is zero. B. there is more tension in the fishing line near weights 1-3 than down by weight 14. C. weight 14 is balanced by no other weight, but weight 1 is balance by 13 others below it. D. the amount of mass per centimeter is higher toward the top, near weights 1-3.
A radio station broadcasts at a frequency of 80 MHz. How far will this signal travel in 67 ms?
A) 60 × 106 m B) 67 m C) 40 × 106 m D) 80 m E) 20 × 106 m