Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard. The reason he doesn't slip off the skateboard is due to
A) inertia in motion.
B) momentum change.
C) friction between his feet and the board.
Answer: C
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The _________________ hypothesis includes mergers with smaller galaxies and infalling gas to the standard formation of the Milky Way galaxy
Fill in the blank(s) with correct word
What is main-sequence fitting?
A) a way of forcing stars to fit into a standard main sequence, even when they have some unusual characteristics B) a method for determining the age of a star cluster C) a method for determining the distance to a star cluster by assuming that its main sequence should line up with the main sequence on a standard H-R diagram D) the way we construct an H-R diagram by plotting the surface temperatures and luminosities of stars
A lepton interacts via the strong interaction
a. True b. False Indicate whether the statement is true or false
A student adds two vectors with magnitudes of 200 and 70 . Which one of the following is the only possible choice for the magnitude of their sum?
a. 100 c. 200 b. 280 d. 70