Applying the Newton's version of Kepler's third law (or the orbital velocity law) to a star orbiting 40,000 light-years from the center of the Milky Way Galaxy allows us to determine
A) the total mass of the entire Milky Way Galaxy.
B) the mass of the black hole thought to reside in the center of the galaxy.
C) the percentage of the galaxy's mass that is made of dark matter.
D) the mass of the Milky Way Galaxy that lies within 40,000 light-years of the galactic center.
D
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What is the function of proteins?
a. contains the coded information in the nucleus b. carries coded information from the cell to the rest of the organism c. provides structure and function of organisms d. provides the basic building blocks of a cell e. carries the genetic information of a cell
Middle C has a frequency of 262. Hz. What is the frequency of C an octave higher?
A) 2.10 kHz B) 786. Hz C) 0.524 kHz D) 270. Hz E) 2.62 kHz
Two tuning forks have frequencies of 440 and 522 Hz. What is the beat frequency if both are sounding simultaneously?
A) 962 Hz B) 481 Hz C) 82 Hz D) 55 Hz E) 41 Hz
A friend argues that if mass were really conserved he would never need to refill his gas tank. What explanation do you offer your friend?
A) The atoms (mass) of gasoline are converted into energy by the engine according to E=mImage. B) The Law of Conservation of Mass does not apply to reactions involving combustion or explosion of matter. C) The atoms (mass) of gasoline are converted into exhaust fumes. D) The oil companies make gasoline in a way that it gets used up so that we are always required to replenish it.