The element named ______________ was detected spectroscopically on the Sun before it was found on Earth
Fill in the blank(s) with correct word
helium
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Which statement best describes a neutron star's formation as a supernova explodes and the core begins to collapse inward?
a. neutrinos and antineutrinos combine into neutrons b. electrons and protons combine into neutrons and neutrinos c. electrons and protons combine into neutrons and neutrinos d. electrons and positrons combine into neutrons and neutrinos e. protons and antiprotons combine into neutrons and neutrinos
Water flows over a section of Niagara Falls at a rate of 6.00 × 10^5 kg/s and falls 50.0 m. What is the power dissipated by the waterfall?
a. 588 MW c. 147 MW b. 294 MW d. 60.0 MW
Uniform Circular Motion: When an object moves in uniform circular motion, the direction of its acceleration is
A. in the same direction as its velocity vector. B. in the opposite direction of its velocity vector. C. is directed toward the center of its circular path. D. is directed away from the center of its circular path. E. depends on the speed of the object.
The most fundamental property of a star is its
A) luminosity. B) abundance of elements besides hydrogen and helium. C) mass. D) surface temperature. E) radius.