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

Physics & Space Science

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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

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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

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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

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Instead of thymine, RNA uses the nucleotide base

A) guanine B) uracil C) adenine D) cytosine

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