How are dwarf planets different from planets?
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According to the International Astronomical Union, a dwarf planet must orbit the Sun, not be a satellite of a planet, and be spherical. In addition, a dwarf planet must not have been large enough to clear out most of the smaller objects near its orbit—unlike the other eight planets that grew in the solar nebula by absorbing small bodies that orbited the Sun in similar orbits.
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The energy output of a Seyfert galaxy____
a. changes slowly with a period of weeks b. is a hundred times the luminosity of the entire Milky Way c. is noticeable only in the infrared d. comes from starburst effects e. is concentrated in the spiral arms
A dipole moment is placed in a uniform electric field oriented along an unknown direction. The maximum torque applied to the dipole is equal to 0.1 N.m. When the dipole reaches equilibrium its potential energy is equal to -0.2 J
What was the initial angle between the direction of the dipole moment and the direction of the electric field? A) 10° B) 90° C) 45° D) 30° E) 0
A proton moving at 5.0 × 104 m/s horizontally enters a region where a magnetic field of 0.12 T is present, directed vertically downward. What magnitude force acts on the proton?
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The overall dimming of starlight by interstellar matter is called:
A) extinction. B) reddening. C) absorption. D) emission. E) scattering.