Which two processes can generate energy to help a star or gas cloud maintain its internal thermal pressure?
A) nuclear fusion and nuclear fission
B) nuclear fusion and supernovae
C) nuclear fission and supernovae
D) nuclear fusion and gravitational contraction
D
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Nonscientific practices that make no claims about how the natural world works do not conflict with science
Indicate whether the statement is true or false
A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down
A) Both its velocity and its acceleration point upward. B) Its velocity points upward and its acceleration points downward. C) Its velocity points downward and its acceleration points upward. D) Both its velocity and its acceleration point downward. E) Neither velocity nor acceleration can be determined without additional information.
What is the mass of an electron in MeV/c2?
a. 0.511 MeV/c2 b. 105.7 MeV/c2 c. 1777 MeV/c2 d. none of the above
A change in motion requires a(n) ______________
Fill in the blank(s) with correct word