According to the nebular theory, how did the Oort cloud form?
A) It is material left over from the interstellar cloud that never contracted with the rest of the gases to form the solar nebula.
B) It is made of planetesimals that formed beyond Neptune's orbit and never accreted to form a planet.
C) It consists of objects that fragmented from the Sun during a catastrophic collision early in the formation of the solar system.
D) It is made of planetesimals between the orbits of Mars and Jupiter that never formed into a planet.
E) It is made of planetesimals formed in the outer solar system that were flung into distant orbits by encounters with the jovian planets.
E) It is made of planetesimals formed in the outer solar system that were flung into distant orbits by encounters with the jovian planets.
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A copper wire of length 10 cm is in a magnetic field of 0.30 T. If it has a mass of 20 g, what minimum current through the wire would cause a magnetic force equal to its weight?
a. 4.9 A c. 2.0 A b. 6.5 A d. 1.3 A
When a guitar is tuned to adjust it pitch, what is it that is changed?
A) The wavelength of the fundamental. B) The amplitude of the fundamental. C) The frequency of the fundamental.
When light of one wavelength from air hits a smooth piece of glass at an angle, which of the following will not occur?
a. reflection b. refraction c. dispersion d. All of the above will occur.
A 60.0-kg man stands at one end of a 20.0-kg uniform 10.0-m long board. How far from the man is the center of mass (or center of gravity) of the man-board system?
A) 1.25 m B) 2.50 m C) 5.00 m D) 7.50 m E) 9.00 m