Which of the following statements about brown dwarfs is not true?
A) Brown dwarfs eventually collapse to become white dwarfs.
B) Brown dwarfs are supported against gravity by degeneracy pressure, which does not depend on the object's temperature.
C) Brown dwarfs form like ordinary stars but are too small to sustain nuclear fusion in their cores.
D) All brown dwarfs have masses less than about 8% that of our Sun.
A) Brown dwarfs eventually collapse to become white dwarfs.
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Equilibrium: If the sum of both the external torques and the external forces on an object is zero, then the object must be at rest.
A. True B. False
Naturally radioactive nuclei can decay spontaneously by emitting the following particles:
a. helium nuclei, electrons, photons b. electrons, neutrons, protons c. helium nuclei, electrons, protons d. electrons, neutrons, photons e. quarks and leptons
Astronomy has shown us that the fundamental laws of physics are
A) the same everywhere in the universe B) the same in our solar system but different beyond the solar system C) completely random and unpredictable D) different on other planets in our solar system
My hair dryer is rated at 1500. watts and my television only uses 100. watts, so why do I pay more for electricity for my TV than for my hair dryer in a year?
What will be an ideal response?