Which has a greater mass: four protons or a helium nucleus with two protons and two neutrons?
A) four protons
B) the helium nucleus
C) They have the same mass.
A) four protons
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Which is a reason that we know dark energy is a major componentof the universe?
a) The universe would not be 2.7 degrees Kelvin today without dark energy. b) The gravity due to regular matter in the universe would have started it contractingagain by now without dark energy. c) Supernovae would not occur without dark energy. d) Dark energy is needed in order that light can escape from supermassive black holes. e) The universe is flat and regular matter doesn't contribute enough energy density.
Summarize in your own words, the three "hallmarks" of science?
What will be an ideal response?
What do astronomers think is the cause of the active volcanism occurring on Jupiter's moon Io?
What will be an ideal response?
For a quantity of ideal gas, which of the following is constant?
a. PTV b. P/TV c. PT/V d. PV/T