Relative Velocity: A swimmer heading directly across a river that is 200 m wide reaches the opposite bank in 6 min 40 s. During this swim, she is swept downstream 480 m. What is the speed of the current?
A. 0.50 m/s
B. 0.80 m/s
C. 1.2 m/s
D. 1.4 m/s
E. 1.8 m/s
Answer: C
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What will be an ideal response?
Suppose that the build-up of fatty tissue on the wall of an artery decreased the radius by 10%. By what percent would the arterial pressure difference produced by the heart have to be increased to maintain a constant blood flow?
A) 48% B) 52% C) 50% D) 46% E) 54%