The light radiated from the Sun's surface reaches Earth in about 8 minutes. However, the energy of this light was released by fusion in the Sun's core about
A) 8 minutes ago.
B) several thousand years ago.
C) 11 years ago.
D) several hundred years ago.
E) several hundred thousand years ago.
E
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Energy to support a reasonable total biomass of ongoing life in a Europan ocean would probably come from
A) sunlight filtering through the ice B) organic material filtering down from the surface C) deep-sea volcanic vents D) meteoroid impacts on the surface
The proton-proton cycle converts all of the mass of the four hydrogen atoms into pure energy
Indicate whether the statement is true or false
The graph shows the force on an object as it moves a distance x. What is the work done by the force when the object moves from 0.0 m to 4.0 m?
A. 6.0 J
B. 8.0 J
C. 10 J
D. 12 J
E. 14 J
Instead of thymine, RNA uses the nucleotide base
A) guanine B) uracil C) adenine D) cytosine