Why did the era of nucleosynthesis end?
A) Too many heavy elements were produced.
B) Neutrinos carried off too much energy.
C) The temperature of the universe became too low.
D) The density of the universe became too low.
D
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What is the composition of Jupiter?
a. mostly carbon dioxide and methane b. mostly methane c. mostly helium and carbon dioxide d. mostly nitrogen e. mostly hydrogen and helium
Referring to how many kilograms of ice can a 3-ton refrigeration unit produce in a 24-hour period? The heat of fusion of water is 330 kJ/kg.
GIVEN - A three-ton refrigeration unit - Heat of fusion of ice is 330 kJ/kg FIND (a) Kilograms of ice produced by the unit per 24 hour period (b) The refrigeration unit capacity is the net value, i.e., it includes heat losses ASSUMPTIONS (a) Water is cooled to just above the freezing point before entering the unit
In a thick bed of sedimentary rocks we find an igneous dike. The order of formation is
A) together. B) igneous before sedimentary. C) sedimentary before igneous. D) unknown.
What would be the expected radius of a nucleus having 82 protons and 125 neutrons?
A) 5.2 fm B) 5.9 fm C) 6.0 fm D) 7.1 fm E) 17 fm