I Have an Exam Tomorrow and I so here are some question

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This discussion centers on physics problems related to fluid dynamics and forces, specifically addressing Pascal's principle, buoyancy, and the continuity equation. Key calculations include determining the force on pistons in a dentist's chair using fluid pressure, calculating the density of a gold nugget based on its apparent weight in water, and finding the maximum velocity of water through a reduced pipe diameter. Additionally, the discussion covers the speed of air in a duct and the coefficient of kinetic friction for a box being pushed across a floor.

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  • Understanding of Pascal's principle and fluid pressure
  • Knowledge of buoyancy and density calculations
  • Familiarity with the continuity equation in fluid dynamics
  • Basic concepts of friction and force calculations
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2. The pascal principle is used to operate a dentists chair. assume that the pressure everywhere in the fluid is 13.5 kpa. if the small cylinder(piston) has an area of 0.007m(squared) and the large cylinder(piston) has an area of 0.08m(squared) calculate the force on each cylinder.












3. a gold nugget weighs 1.23N in air. when suspended from a string and submerged in water its apparent weight (T) is 1.09N. calculate the density of the gold nuggett.












4.water enters a cylindrical pipe 3.5cm in diameter at a speed of 1.6m/s. if the pipes diameter is suddenly reduced to 2.1cm, what is the max velocity of the water moving through the smaller pipe?












5. air is pushed through a forced-air furnace duct at a speed of 4.7m/s. the duct is rectangular and measure 58cm by 23cm. how fast will air move through a smaller portion of the duct that is also rectangular and measures 35cm by 23cm.












6. a force of 19N[E] pushes a box of mass 13.2kg across a level floor at a constant speed. calculate the coefficient of kinetic friction (,U) between the two surfaces.












i know its a lot of work there so you can do all of them or just 1 or how every many you want to. I am just struggling on these questions and my exam is tomorrow and i really need some help so if you guys are able to help me out i would really appreciate it. thanks so much for doing this guys. :smile:
 
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Welcome to PF, Raidersfan. However, please note that we cannot help you with textbook/homework questions, until you have first shown us your efforts: In future, please use all the sections of the homework posting template with which you were provided:

So, please post some thoughts on each question, and we'll be more than happy to help!
 

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