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John was swimming in the river. His swimming velocity was 0.7 m/s due east. The water...

John was swimming in the river. His swimming velocity was 0.7 m/s due east. The water was running at 0.1 m/s due west. John’s projected area in the water was 0.45 m2 . Water density was 1000 kg/m3 . The coefficient of drag was 0.2.

(a) What was John’s velocity relative to the water?

(b) What was the pressure drag force from the water?

After a little while, John turned around and now is swimming at 0.7 m/s due west.

(c) What is John’s velocity relative to the water now?

(d) What is the pressure drag force from the water now?

(e) What is the percentage of change in pressure drag force?

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