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Assume a water strider has a roughly circular foot of radius $0.02 \mathrm{mm}$. (a) What is the maximum possible upward force on the foot due to surface tension of...

Question

Assume a water strider has a roughly circular foot of radius $0.02 \mathrm{mm}$. (a) What is the maximum possible upward force on the foot due to surface tension of the water? (b) What is the maximum mass of this water strider so that it can keep from breaking through the water surface? The strider has six legs.

Assume a water strider has a roughly circular foot of radius $0.02 \mathrm{mm}$. (a) What is the maximum possible upward force on the foot due to surface tension of the water? (b) What is the maximum mass of this water strider so that it can keep from breaking through the water surface? The strider has six legs.



Answers

A firehose must be able to shoot water to the top of a building 28.0 m tall when aimed straight up. Water enters this hose at a steady rate of 0.500 m$^3$/s and shoots out of a round nozzle. (a) What is the maximum diameter this nozzle can have? (b) If the only nozzle available has a diameter twice as great, what is the highest point the water can reach?


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