Physics Properties Of Matter Level: High School
Bernoulli’s Principle
a)Use Bernoulli’s equation to estimate the upward force on an airplane’s wing if the average flow speed is 193 m/s above the wing and 162 m/s below the wing . The density of the air is 1.2 kg/m^3 and the area of each wing surface is 25 m^2 .
b) Is the force upward or downward ?
Physics Properties Of Matter Level: High School
Equation of Continuity
A nozzle of inner radius 1.05 mm is connected to a hose of inner radius 7.95 mm . The nozzle shoots out water moving at 25.4 m/s . a) At what speed is the water in the hose moving ? b) What is the volume flow rate ? c) What is the mass flow rate ?
Physics Properties Of Matter Level: High School
Archimedes’s Principle
A piece of metal is released under water . The volume of the metal is 60.7 cm^3 and its specific gravity is 4.6 . What is its initial acceleration ? ( Note : When v = 0 , there is no drag force )
Physics Properties Of Matter Level: High School
Archimedes’s Principle
a) What is the buoyant force on 0.70 kg of ice floating freely in liquid water ?
b) What is the buoyant force on 0.70 kg of ice that is held completely submerged under water ?
Physics Properties Of Matter Level: High School
Estimate the average blood pressure in a person’s foot , if the foot is 1.38 m below the aorta , where the average blood pressure is 105 mm Hg . For the purposes of this estimate , assume the blood isn’t flowing .
Physics Properties Of Matter Level: High School
A manometer using oil (density 0.89 g/cm^3) as a fluid is connected to an air tank . Suddenly the pressure in the tank increases by 0.77 cm Hg .a) By how much does the fluid level rise in the side of the manometer that is open to the atmosphere ?
b) What would your answer be if the manometer used mercury (Hg = 13.6 g/cm^3 ) instead ?
Physics Properties Of Matter Level: High School
The density of platinum is 21500 kg/m^3 . Find the volume of 1.47 kg of platinum and compare it to the volume of 1.47 kg of aluminum .
Physics Properties Of Matter Level: High School
Hydrostatic Pressure
At the surface of a freshwater lake the pressure is 102 Paa) What is the pressure increase in going 35.2 m below the surface ?
b) What is the approximate pressure decrease in going 37 m above the surface ? Air at 20 degree C has density of 1.2 kg/m^3 .
Physics Properties Of Matter Level: High School
Pascal’s Law
Depressing the brake pedal in a car pushes on a piston with cross-sectional area 2.3 cm^2 . The piston applies pressure to the brake fluid ,which is connected to two pistons . each with area 12.3 cm^2 . Each of these pistons presses a brake pad against one side of a rotor attached to one of the rotating wheels (see the figure at “click here”)a) When the force applied by the brake pedal to the small pistons is 7.9 N , What is the normal force applied to each side of the rotor ?
b) If the coefficient of kinetic friction between a brake pad and a rotor is 0.79 and each pad is (on average) 12 cm from the rotation axis of the rotor , What is the torque on the rotor due to the two pads ?
Physics Properties Of Matter Level: High School
Pascal’s Law
In a hydraulic lift , the diameter of the pistons of are 4.95 cm and 20.2 cm . A car weighing W = 10.1 kN is to lifted by the force of the large piston .a) What force Fa must be applied to the small piston ?
b) When the small piston is pushed in by 10.3 cm , how far is the car lifted ?
c) Find the mechanical advantage of the lift , which is the ratio W/Fa .
Physics Properties Of Matter Level: High School
An experiment to determine the specific heat of a gas makes use of a water manometer attached to a flask . Initially the two columns of water are even . Suppose that atmospheric pressure is 1.2 10^5 Pa . After heating the gas , the water levels change to those . Find the change in pressure of the gas in Pa .
Physics Properties Of Matter Level: High School
Estimate the average blood pressure in a person’s foot , if the foot is 1.38 m below the aorta , where the average blood pressure is 107 mm Hg . For the purpose of this estimate , assume the blood isn’t flowing .
Physics Properties Of Matter Level: High School
Archimedes Principle
A block of wood floats in oil with 87.9% of its volume submerged . What is the density of the oil ? The density of the block of wood is 0.68 g/cm^3 .
Physics Properties Of Matter Level: High School
Bernoulli’s Principle
An airplane flies on a level path . There is a pressure difference of 520 Pa between the lower and upper surface of the wings . The area of each wing surface is about 170 m^2 . The air moves below the wings at a speed of 80.1 m/s .a) Estimate the weight of the plane .
b) Estimate the air speed above the wings .
Physics Properties Of Matter Level: High School
Archimede’s Principle
An aluminum cylinder weighs 1.01 N , When this same cylinder is completely submerged in alcohol , the volume of the displaced alcohol is 3.90 10^-5 m^3 . The apparent weight of the cylinder when completely submerged is 0.740 N . What is the specific gravity of the alcohol ?