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6.  The aorta is a major artery, rising upward
from the left ventricle of the heart and curving down to carry blood to the
abdomen and lower half of the body. The curved artery can
be approximated as a semicircular arch whose diameter is 5.0 cm. If
blood flows through the aortic arch at a speed of 0.32 m/s, what is the
magnitude (in m/s2) of the blood’s centripetal acceleration?
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