PHYS 1010 Final Exam Questions with
Correct Answers
What is the absolute pressure at a depth of 9.73 m below the surface of a deep lake? Take 1.01 x
10^5 Pa as atmospheric pressure. 1.96 x 10^5 Pa
A platinum sphere with radius 1.21 cm is totally immersed in mercury. Find the weight of the
sphere's apparent weight. The densities of platinum and mercury are 2.14 x 10^4 kg/m^3 and
1.36 x 10^4 kg/m^3, respectively. 1.56 N
Consider the hydraulic lift shown in the figure below. What force will the large piston provide if
the small piston is pushed down with a force of 17.0 N? 2060 N
You spray your sister with water from a garden hose. The water is supplied to the hose at a rate
of .111 liters per second and the diameter of the nozzle you hold is 5.79 mm. At what speed does
the water exit the hose? 4.22 m/s
A horizontal pipe carries a smoothly liquid with density 1.25 x 10^3 kg/m^3. At locations 1 and
2 along the pipe the diameters are 6.63 cm and 2.51 cm, respectively. Is the flow speed at
location 2 higher or lower than at location 1? Higher
, A fluid, with a density of p=1165 kg/m3, flows in a horizontal pipe. In one segment of the pipe
the flow speed is v1=4.53 m/s. In a second segment the flow speed is v2=1.77 m/s. What is the
difference between the pressure in the second segment (p2) and the pressure in the first segment
(p1) 10130 Pa
Fluid originally flows through atube at a rate of 200 cm^3/s. Toillustrate the sensitivity of the
Poiseuille flow rate to various factors, calculate the new flowrate for the following changes with
all other factors remaining the same as in the original conditions: a new fluid with 6.00 times
greater viscosity is substituted. Poiseuille flow is given by Q=[(P2-P1) 33.3 cm^3/s
For which case will the flow rate increase for Poiseuille flow? The pressure difference
increase
What is the greatest average speed of blood flow in an artery of radius 1.80 mm if the flow is to
remain laminar? Take the density of blood to be 1025 kg/m^3. Use Nr=2000 as the limit of
laminar flow, and =2.084 mPa*s. 1.13 m/s
Oxygen diffuses through a membrane which is 1.000 mm thick. How long does it take the
average oxygen molecule to do this in water with D=1.0*10^-9m^2/s? 500 s
Correct Answers
What is the absolute pressure at a depth of 9.73 m below the surface of a deep lake? Take 1.01 x
10^5 Pa as atmospheric pressure. 1.96 x 10^5 Pa
A platinum sphere with radius 1.21 cm is totally immersed in mercury. Find the weight of the
sphere's apparent weight. The densities of platinum and mercury are 2.14 x 10^4 kg/m^3 and
1.36 x 10^4 kg/m^3, respectively. 1.56 N
Consider the hydraulic lift shown in the figure below. What force will the large piston provide if
the small piston is pushed down with a force of 17.0 N? 2060 N
You spray your sister with water from a garden hose. The water is supplied to the hose at a rate
of .111 liters per second and the diameter of the nozzle you hold is 5.79 mm. At what speed does
the water exit the hose? 4.22 m/s
A horizontal pipe carries a smoothly liquid with density 1.25 x 10^3 kg/m^3. At locations 1 and
2 along the pipe the diameters are 6.63 cm and 2.51 cm, respectively. Is the flow speed at
location 2 higher or lower than at location 1? Higher
, A fluid, with a density of p=1165 kg/m3, flows in a horizontal pipe. In one segment of the pipe
the flow speed is v1=4.53 m/s. In a second segment the flow speed is v2=1.77 m/s. What is the
difference between the pressure in the second segment (p2) and the pressure in the first segment
(p1) 10130 Pa
Fluid originally flows through atube at a rate of 200 cm^3/s. Toillustrate the sensitivity of the
Poiseuille flow rate to various factors, calculate the new flowrate for the following changes with
all other factors remaining the same as in the original conditions: a new fluid with 6.00 times
greater viscosity is substituted. Poiseuille flow is given by Q=[(P2-P1) 33.3 cm^3/s
For which case will the flow rate increase for Poiseuille flow? The pressure difference
increase
What is the greatest average speed of blood flow in an artery of radius 1.80 mm if the flow is to
remain laminar? Take the density of blood to be 1025 kg/m^3. Use Nr=2000 as the limit of
laminar flow, and =2.084 mPa*s. 1.13 m/s
Oxygen diffuses through a membrane which is 1.000 mm thick. How long does it take the
average oxygen molecule to do this in water with D=1.0*10^-9m^2/s? 500 s
