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Air flows through a heating duct with a square cross-section with 7-inch

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Question

Air flows through a heating duct with a square cross-section with 7-inch sides at a speed of 4.9 ft/s. Just before reaching an outlet in the floor of a room, the duct widens to assume a square cross-section with sides equal to 16 inches. Compute the speed of the air flowing into the room (in ft/s), assuming that we can treat the air as an incompressible fluid.

 
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What is the average difference in the air pressure between the top and bottom of the wing?

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Question

The wing of an airplane has an average cross-sectional area of 14 m2 and experiences a lift force of 86,000 N. What is the average difference in the air pressure between the top and bottom of the wing?

 
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what is the ratio of the area of the plunger to the area of the piston?

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Question

A dentist’s chair with a person in it weighs 1725 N. The output plunger of a hydraulic system starts to lift the chair when the dental assistant’s foot exerts a force of 41 N on the input piston. Neglecting any difference in the heights of the piston and the plunger, what is the ratio of the area of the plunger to the area of the piston?

Aplunger/Apiston=

 
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A scale reads 334 N when a piece of brass is hanging from it

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Question

A scale reads 334 N when a piece of brass is hanging from it. What does it read (in N) when it is lowered so that the brass is submerged in water?

 
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