Chapter9_Problems_answer_students

Chapter9_Problems_answer_students - Chapter 9- Answer to...

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Chapter 9- Answer to problems: 2,3, 5, 8, 10, 14, 17,34 3. What is the average pressure on the soles of the feet of a standing 90.0-kg person due to the contact force with the floor? Each foot has a surface area of 0.020 m 2 . Given: m a = 90.0kg, the surface area of the adult feet A=2*0.020m 2 Question: P av ? The average pressure on the 2 soles is for A=2xA foot =2x0.020m 2 P av = F/A = (90.0kg)x(9.80m/s 2 ) / 2x(0.020m 2 ) = 22 kPa 8. A nurse applies a force of 4.40 N to the piston of a syringe. The piston has an area of 5.00 10 –5 m 2 . What is the pressure increase in the fluid within the syringe? Given : F = 4.40N the force applied by the nurse, A=5.00x10 -3 the area the force is applied Question: p ? The pressure increase in the fluid is p= F/A= 4.40N/(5.00x10 -5 m 2 ) = 88.0 kPa 14. How high can you suck water up a straw? The pressure in the lungs can be reduced to about 10 kPa below atmospheric pressure. Given : p= p atm p = 10.0kPa the pressure reduction Question : the height = h =-d ? p= p atm + g d, h = -d = (p atm -p)/ g = 10.0kPa / [ ( 1000.0kg/m 3 )x(9.80m/s 2 )] = 1.0m (you will need a big glass !!!!) where h= -d is the height the water can be sucked 40. A piece of metal is released under water. The volume of the metal is 50.0 cm
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Chapter9_Problems_answer_students - Chapter 9- Answer to...

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