Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius by 10%. By how much would the pressure provided by the heart have to be increased to maintain a constant blood flow?
What will be an ideal response?
52%
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Hipparchus devised the magnitude system in the late 1700's
a. True b. False Indicate whether the statement is true or false
How does silica content affect a volcano?
What will be an ideal response?
Which of the following statements about spectral types of stars is not generally true?
A) The spectral type of a star can be used to determine its distance. B) The spectral type of a star can be used to determine its surface temperature. C) The spectral type of a star can be used to determine its color. D) The spectral type of a star can be determined by identifying lines in the star's spectrum.
The terrestrial planets in our solar system are ________
A) Pluto and Eris B) Mars, Jupiter, Saturn, Uranus, and Neptune C) Mercury, Venus, Earth, and Mars D) Jupiter, Saturn, Uranus, and Neptune