The Oort Cloud is believed to have been formed by:
A) planetesimals that were flung far from the Sun in gravitational encounters with the jovian planets.
B) icy bodies formed between stars that have been captured by our solar system's gravity.
C) moons that escaped from the jovian planets.
D) debris from an icy planet that broke apart early in the solar system's history.
E) debris from impacts of planetesimals, asteroids and comets with the jovian planets.
A
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The main reason for positioning many radio telescopes across a large area and combining the signals is
a. to observe more objects in a shorter amount of time. b. provide a backup system if one or more of the telescopes go down. c. to produce higher resolution images. d. to avoid interference between signals from the separate telescopes. e. to account for the motion of objects in the sky as a result of the Earth's rotation.
By locating the north celestial pole (NCP) in the sky, how can you determine your latitude?
A) The altitude of the NCP is the same as your latitude. B) The altitude of the NCP is your angular distance from the North Pole. C) The azimuth of the NCP is the same as your latitude. D) The azimuth of the NCP is the angular distance from the North Pole. E) The altitude of the NCP is the same as your distance from the North Pole.
A container of water is lifted vertically 3.0 m, then returned to its original position. If the total weight is 30. N, how much work was done?
A) 0.18 kJ B) 45 J C) 90 J D) No work was done. E) 0.90 kJ
What is the magnitude of the magnetic field at point P in the figure if a = 2.0 cm, b = 4.5 cm, and I = 5.0 A?
a.
87 ?T, into the paper
b.
87 ?T, out of the paper
c.
0.23 mT, out of the paper
d.
0.23 mT, into the paper
e.
23 ?T, into the paper