1 should a canoe paddle be made rough to get a better grip, Ask an Expert

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1. Should a canoe paddle be made rough to get a "better grip on the water" for paddling purposes? Explain.

2. Two different fluids flow over two identical flat plates with the same laminar free-stream velocity. Both fluids have the same viscosity, but one is twice as dense as the other. What is the relationship between the drag forces for these two plates?

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