The Big Bang theory seems to explain how elements were formed during the first few minutes after the Big Bang. Which hypothetical observation below (these are not real observations) would call our current theory into question?
A) the discovery of a galaxy with 27% helium rather than the 25% that theory tells us was produced in the Big Bang
B) the discovery of a galaxy with a helium abundance of only 10% by mass
C) the discovery of a star-like object made entirely of carbon and oxygen
D) the discovery of a planet that with no helium in its atmosphere
B
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Large scale structures of the Universe include ___________
a. filaments b. voids c. walls d. All of the other choices are correct.
The metal in a chunk of copper or iron is composed of
A) crystals. B) non-crystalline fibers. C) amorphous particles. D) none of the above
The greater the temperature difference between input and output reservoirs of a heat engine, the
A) greater the efficiency. B) smaller the efficiency. C) both of the above D) none of the above
A particle (mass = 4.0 g, charge = 80 mC) moves in a region of space where the electric field is uniform and is given by Ex = -2.5 N/C, Ey = Ez = 0 . If the velocity of the particle at t = 0 is given by vx = 80 m/s, vy = vz = 0, what is the speed of the particle at t = 2.0 s?
a. 40 m/s b. 20 m/s c. 60 m/s d. 80 m/s e. 180 m/s