Which of the following statements best describes the status of the Copernican and Ptolemaic theories of the solar system shortly after Tycho Brahe's observations?
A) These observations showed both theories to be incorrect.
B) These observations turned out to have little or no bearing on either theory.
C) These observations showed Ptolemy's theory to be the correct one.
D) These observations showed Copernicus's theory to be the correct one.
E) These observations showed both theories to be correct.
A
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The Kuiper Belt objects have orbits that:
A) carry them thousands of A.U. beyond the Sun. B) stay out just beyond Neptune and close to the ecliptic. C) stay sixty degrees ahead of or behind Jupiter. D) cross the orbit of Mars at perihelion. E) cross the orbit of Earth at perihelion.
Fred swings around a 0.40 kg ball attached to a string at constant speed in an almost horizontal circle of radius 1.3 meters. If one revolution takes 1.4 s:
(a) What is the angular speed of the ball? (b) What centripetal force is exerted on the ball?
If the maximum possible accuracy in measuring the velocity of a particle increases, the maximum possible accuracy in measuring its position will
A) increase. B) decrease. C) not be affected.
A trapeze artist, with swing, weighs 700 N; he is being held to one side by his partner so that the swing ropes make an angle of 30.0° with the vertical. In such a condition of static equilibrium what is the tension in the rope?
a. 924 N c. 808 N b. 404 N d. 233 N