If you represented each star by a grain of sand, about how much sand would it take to represent all the stars in the observable universe?
A) all the sand in a typical playground sandlot
B) all the sand on Miami Beach
C) all the sand on the beaches of California
D) one cubic meter of sand
E) all the sand on all the beaches on Earth
E) all the sand on all the beaches on Earth
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A fragment of a collapsing gas cloud that comes to equilibrium with a central temperature of 4 million K will become a:
A) black hole. B) brown dwarf. C) black dwarf. D) T Tauri star. E) stage 1 protostar.
The reason that the atmosphere of Venus is over 95% carbon dioxide is thought to be because:
A) Venus was much hotter than Earth when its atmosphere formed. B) the early plant life on Venus produced the excess carbon dioxide and consumed the oxygen. C) life on Earth formed earlier than on Venus. D) the part of the solar nebula where Venus formed contained more carbon dioxide than the part where Earth formed. E) Venus' Greenhouse Effect got out of control and became runaway after its oceans of sulfuric acid evaporated.
A ping-pong ball covered with a conducting graphite coating has a mass of 5.4 × 10^?3 kg and a charge of 3.8 µC. What electric field directed upward will exactly balance the weight of the ball? (g = 9.8 m/s2)
a. 7.2E+1 N/C b. 1.4E+4 N/C c. 6.3E–8 N/C d. 2.1E+6 N/C e. 6.9E+6 N/C
In an ideal transformer, how many turns are necessary in a 110-V primary if the 24-V secondary has 100 turns?
A) 458 B) 240 C) 110 D) 22