The most significant difference between the astronomical theories of Ptolemy and Copernicus is
A) Ptolemy's is not based on scientific evidence, while Copernicus's is.
B) Ptolemy's theory does away with many of the complexities of the Copernican theory.
C) Ptolemy's theory is sun-centered, whereas Copernicus's is Earth-centered.
D) Ptolemy uses circular planetary orbits while Copernicus uses elliptical orbits.
E) Ptolemy's theory is Earth-centered, whereas Copernicus's is sun-centered.
C
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Gravitational Potential Energy: In 1994, fragments of Comet P/Shoemaker-Levy 9 collided with Jupiter. Assume that these fragments came from very very far away with no initial speed, and neglect the effect of the sun. What was their speed when they neared Jupiter's surface at a distance of 71.4 × 106 m from its center? Jupiter has a mass of 1.90 × 1027 kg, and G = 6.67 × 10-11 N ? m2/kg2.
A. 10,400 m/s B. 11,200 m/s C. 35,500 m/s D. 42,100 m/s E. 59,600 m/s
A 2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kN. What is the frequency of the fundamental mode of vibration of this wire?
A) 204 Hz B) 102 Hz C) 408 Hz D) 510 Hz E) 153 Hz
A 1.500 m long uniform beam of mass 30.00 kg is supported by a wire as shown in the figure. The beam makes an angle of 10.00 degrees with the horizontal and the wire makes and angle of 30.00 degrees with the beam. A 50.00 kg mass, m, is attached to the end of the beam. What is the tension in the wire?
A. 2,034 N
B. 1,855 N
C. 1,435 N
D. 1,255 N
E. 1,035 N
Neglecting friction, a ball rolling along a horizontal plane will
1) accelerate indefinitely. 2) roll until the force used to roll it was used up. 3) roll indefinitely at a constant speed. This illustrates 4) the basic principle that a body requires a push or pull to keep it moving. 5) inertia. 6) the law of net force.