About 2% of our solar nebula consisted of elements besides hydrogen and helium. However, the very first generation of star systems in the universe probably consisted only of hydrogen and helium
Which of the following statements is most likely to have been true about these first-generation star systems? A) There were no comets or asteroids in these first-generation star systems.
B) Jovian planets in these first-generation star systems had clouds made of water and other hydrogen compounds.
C) These first-generation star systems typically had several terrestrial planets in addition to jovian planets.
D) Like the jovian planets in our solar system, the jovian planets in these first-generation systems were orbited by rings.
A
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As a block slides down a frictionless incline, which of the following statements is true?
a. Both its speed and acceleration increase. b. Its speed increases and its acceleration remains constant. c. Its speed and acceleration remain constant. d. Its speed increases and its acceleration decreases. Both its speed and acceleration decrease.
Fragments of rocks formed due to erosion settle out to form layers of
A) sediment B) precipitate C) deposit D) residuum
The Planck time is
A) the shortest time that has any physical meaning. B) the time required for pair creation. C) the time it takes for light to travel across--or around--the entire universe. D) the time when the cosmic background radiation originated. E) the time it takes for an electron in an unexcited hydrogen atom to orbit the nucleus one time.
When resistors with different resistances are connected in series, which of the following must be the same for each resistor? Choose all correct answers
1.potential difference 2.current 3.power delivered 4.charge entering 5.none of these answers