The Copernican system was no more accurate than the Ptolemaic system in predicting the positions of the planets because ___________just as in the Ptolemaic system
a. the Copernican system assumed the Earth was at rest at the center.
b. the Copernican system used elliptical planetary orbits
c. the Copernican system used uniform circular motion.
d. the Copernican system assumed all planets orbited the Sun
C
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A solid shaft of 1020 steel with an outside radius of 1.002 cm is to be inserted inside a hollow 1020 steel shaft with an inside radius of 1.000 cm. This is to be accomplished by heating the hollow shaft sufficiently so that the solid shaft can be inserted into the hollow shaft with a radial clearance of 0.002 cm. When the two shafts are brought to room temperature, they will be bonded together as a single unit. This process is called a shrink fit. To what temperature must the hollow shaft be heated for this process, assuming that the solid shaft is at 300 K?
What will be an ideal response?
How is radioactive dating used to determine the age of an object?
a. Both the amounts of radioactive and decay material are measured. Using these with the radioactive material's half-life, the age can be estimated. b. The amount of radioactive material is measured. Using this with the radioactive material's half-life, the age can be estimated. c. The amount of decay material is measured. Using this with the radioactive material's half-life, the age can be estimated. d. The amount of heat generated by radioactive dating is measured to determine age.
In essence, most of the extrasolar planets discovered to date have been found by
A) closely examining very high-resolution photographs of other star systems. B) observing a star carefully enough to notice that it is experiencing a gravitational tug caused by an unseen planet. C) identifying spectral lines that look like what we expect to see from a planet rather than a star. D) observing mini-eclipses of a star as an unseen planet passes in front of it.
Everything looks red through a red filter because
A) the filter transmits red light and absorbs other colors. B) the filter reflects red light and transmits other colors. C) the filter emits red light and absorbs other colors. D) the filter absorbs red light and emits other colors.