According to the nebular theory, how did the Oort cloud form?
A) It consists of objects that fragmented from the protosun during a catastrophic collision early in the formation of the solar system.
B) It is made of planetesimals between the orbits of Mars and Jupiter that never formed into a planet.
C) It is material left over from the interstellar cloud that never contracted with the rest of the gases to form the solar nebula.
D) It is made of planetesimals that formed beyond Neptune's orbit and never accreted to form 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
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Which of the following statements is true of reconnection events?
A) They refer to the breaking of identically directed magnetic field lines in a plasma. B) Kinetic and thermal energy in plasmas with low conductivity are converted to magnetic energy. C) Solar flares occur in active regions where oppositely directed magnetic fields meet and cancel each other. D) They generate and release magnetic fields as long-wavelength photons and low-energy electrons.
At 22.0°C an aluminum ring has an inner diameter of 7.000 cm, and a brass rod has a diameter of 7.090 cm. Keeping the brass rod at 22.0°C, which of the following temperatures of the ring will allow the ring to just slip over the brass rod? (?Al = 2.4 × 10^?5 /C°, ?brass = 1.9 × 10^?5/C°)
a. 536°C b. 418°C c. 190°C d. 558°C e. 725°C
A coaxial cable has an inner cylindrical conductor surrounded by cylindrical insulation and an outer cylindrical conducting shell. The outer shell carries the same current but in the opposite direction from that in the inner conductor as shown. If the coaxial cable sits in a uniform magnetic field directed upwards with respect to the cable, the effect of the field on the cable is
A. a net force to the left. B. a net force to the right. C. a net force upwards. D. no net force but a slight shift of the inner conductor to the left and the outer conductor to the right. E. no net force but a slight shift of the inner conductor to the right and the outer conductor to the left.
The Sun's life time is 10 billion years. About how long is the lifetime of a star with a star has a mass of 0.1 MSun and a luminosity of 0.01 LSun?
A) 1 billion years B) 100 million years C) 100 billion years D) 10 million years