Physics short answer

Question #4 ! Only 1!!!!!!!!!!

Answer the list of questions that is based on solids and fluids. a. Determine the total pressure on a scuba diver a point 50 meter below the water’s surface. Use P atm = 101,325 Pa and ρwater = 1,000 kg/m3.
Answer: _____________Pa

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b. A person is swimming in the Dead Sea – known for its high content of salt. The person has difficulty floating in other parts of the world, but the Dead Sea makes it easy for any person to float with no difficulty. Determine the buoyant force exerted on the person. Use ρ Dead Sea = 1.25 g/m3 , V person = 60,000 cm3 . Hint: First convert everything into standard units, kilograms and meters.

(needs a sketch)

c. A patient makes an appointment with the doctor’s office to receive a tetanus shot. While receiving the tetanus shot, the doctor exerted pressure on a plunger to transmit the fluid from the barrel to the needle, then the fluid travels from the needle to the patient. The barrel has a radius of 1.8 mm, while the syringe has a radius of .06 mm. If the fluid travels at a speed of .025 m/s through the barrel of the syringe, how fast will the fluid travel in the syringe? Hint: First convert everything into standard units, meters. Use A = 𝜋𝑟 2 for the cross-sectional areas of the barrel and needle.

Answer: _____________m/s

d. Write down three units of pressure used in our everyday lives. For example, mm Hg is the unit of pressure used to measure the systolic and diastolic blood pressure – this can be easily done by using a small gauge attached to an inflatable cuff. Use three of your own examples
Unit: _______ Application:
Unit: _______ Application:
Unit: _______ Application:

Work must be shown.

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