Physics Properties Of Matter Level: High School
Pressure
The deepest know ocean depth is Mariana Trench off the coast of the Philippines- it has been measured to be about 6.8 miles. It the sea water is about 2.6% more dense than fresh due to its dissolved salt , what is the pressure (lb/ft^2) at the bottom of the Trench. Convert your answer to atm, psig, and pa .
Physics Properties Of Matter Level: High School
Fluids
Use Bernoulli’s equation to estimate the upward force on an airplane’s wing if the average flow speed of air is 192 m/s above the wing and 160 m/s below the wing . The density of the air is 1.1 kg/m^3 and the area of each wing surface is 26 m^2 .
Physics Properties Of Matter Level: High School
Equation of Continuity
A garden hose of inner radius 0.5 cm carries water at 1.2 m/s . The nozzle at the end has radius 0.21 cm . How fast does the water move through the nozzle ?
Physics Properties Of Matter Level: High School
Archimedes Principle
A cylindrical disk has volume 8.97 x 10^-3 m^3 and mass 8.16 kg . The disk is floating on the surface of some water with its flat surface horizontal . The area of each flat surface is 0.637 m^2 .a) What is the specific gravity of the disk ?
b) How far below the water level is its bottom surface ?
c) How far above the water level is its top surface ?
Physics Properties Of Matter Level: High School
Pressure
A container has a large cylindrical lower part with a long thin cylindrical neck . The lower part of the container holds 12.5 m^3 of water and the surface area of the bottom of the container is 4.76 m^2 . The height of the lower part of the container is h1 = 3.20 m and the neck contains a column of water h2 = 8.80 m high . The total volume of the column of water in the neck is 0.200 m^3 , what is the magnitude of the force exerted by the water on the bottom of the container ?
Physics Properties Of Matter Level: High School
Pressure
At the surface of a freshwater lake the pressure is 101 kPa .a) What is the pressure increase in going 34.8 m below the surface ?
b) What is the approximate pressure decrease in going 35 cm 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 2.0 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 piston is 7.8 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 the rotor is 0.80 and each pad is (on average) 11 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
Pressure
The pressure inside a bottle of champagne is 4.9 atm higher than the air pressure outside . The neck of the bottle has an inner radius of 0.9 cm . What is the friction force on the cork due to the neck of the bottle ?
Physics Properties Of Matter Level: High School
Pressure
What is the average pressure on the soles of the feet of a standing 86.5 kg person due to the contact force with the floor ? Each foot has a surface area of 0.021 m^2 .
Physics Properties Of Matter Level: High School
Stream Line Flow
Which one of the following statements concerning streamline flow is true ?a) At any given point in the fluid , the velocity is constant in time
b) Streamline flow occurs when there are sharp obstacles in the path of a fast moving fluid .
c) Streamline flow is described by Pascal’s principle.
d) Streamline flow is described by Archimedes Principle .
The velocity vectors are the same for all particles in the fluid .
Physics Properties Of Matter Level: High School
Kinetic Energy of a Gas Molecule
A gas molecule with a molecular mass of 32.0 u has a speed of 325 m/s . What is the temperature of the gas molecule ?a) 72.0 K
b) 136 K
c) 305 K
d) 459 k
A temperature cannot be assigned to a single molecule .
Physics Properties Of Matter Level: High School
Solids
A plastic box has an initial volume of 2.00 m^3 . It is then submerged below the surface of a liquid and its volume decreases to 1.97 m^3 . Complete the following statement . In order to calculate the “stress” on the box , in addition to the information given , one must also know .a) the mass of the box
b) the bulk modulus of the material from which the box is made.
c) the shear modulus of the material from which the box is made .
d) the Young’s modulus of the material from which the box is made .
e) the bulk modulus of the liquid .
Physics Properties Of Matter Level: High School
Pascal’s Law
In a hydraulic lift , the diameters of the pistons are 5.00 cm and 20.4 cm . A car weighing W = 10.2 kN is to be lifted by the force of the large piston ?b) When the small piston is pushed in by 10.1 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
Solids (Young’s Modulus )
A spring is hung from a ceiling , and an object attached to it’s lower end stretches the spring by a distance of 5.00 cm from its unstretched position when the system is in equilibrium . If the spring constant is 47.5 N/m . Determine the mass of the object .
Physics Properties Of Matter Level: High School
Solid (Bulk Modulus )
A copper cylinder and a brass cylinder are stacked end to end , Each cylinder has a radius of 0.30 cm . A compressive force of F = 6000 N is applied to right end of the brass cylinder . Find the amount by which the length of the stack decreases .