Physics Properties Of Matter Level: High School
If the average volume flow of blood through the aorta is 9.4 10^-5 m^3/s and the cross sectional area of the aorta is 3.2 10^-4 m^2 , What is the average speed of blood in the aorta ?
Physics Properties Of Matter Level: High School
Equation of continuity
Water entering a house flows with a speed of 0.23 m/s through a pipe of 2.5 cm inside diameter . What is the speed of the water at a point where the pipe tapers to a diameter of 4.8 mm ?
Physics Properties Of Matter Level: High School
The maximum pressure most organisms can survive is about 1000 times atmospheric pressure . Only small , simple organisms such as tadpoles and bacterial can survive such high pressure . What then is the maximum depth at which these organisms can live under the sea (assuming that the density of seawater is 1021 kg/m^3 ) ?
Physics Properties Of Matter Level: High School
At the surface of a freshwater lake the air pressure is 1.0 atm . At what depth under water in the lake is the water pressure 4.5 atm ?
Physics Force & Laws Of Motion Level: High School
On takeoff , the combined action of the engines and wings of an airplane exerts an 8000-N force on the plane , directed upward at an angle of 65 degrees above the horizontal . The plane rises with constant velocity in the vertical direction while continuing to accelerate in the horizontal direction . What is the weight of the plane ? What is the horizontal acceleration ?
Physics Properties Of Matter Level: High School
Bernoulli’s Principle
An airplane fires on a level path . There is a pressure difference of 500 Pa between the lower and upper surface of the wings . The area of each wing surface is about 100 meters squared . The air move below the wings at a speed of 80.5 m/s . Estimatea) The weight of the plane .
b) The speed of the air above the wings .
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Physics Properties Of Matter Level: High School
Archemedes Principle
What is the buoyant force on 0.90 kg of ice floating freely in liquid water ?b) What is the buoyant force on 0.90 kg of ice that is held completely submerged under water ?
Physics Properties Of Matter Level: High School
In the Netherlands , a dike holds back the sea from a town below sea level . The dike springs a leak 3.0 m below the water surface . If the area of the hole in the dike 1.0 cm squared , what force must the Dutch boy exert in order to save the town ?
Physics Properties Of Matter Level: High School
At the surface of a freshwater lake the air pressure is 1.0 atm . At what depth under water in the lake is the pressure 4.0 atm .
Physics Properties Of Matter Level: High School
What is the average pressure on the soles of feet of a 90 kg person due to the contact force with the floor ? Each foot has a surface area of 0.020 meters squared .
Physics Properties Of Matter Level: High School
Pascal’s Law
In a hydraulic lift , the diameters of the pistons are 5 cm and 20 cm . A car weighing W = 10.0 Kn is to be lifted by the force of the large piston .a) What is the force F(a) that must be applied to the small piston ?
b) When the small piston is pushed in by 10.0 cm , how far is the car lifted ?
c) Find the mechanical advantage of the lift for which the ratio is W/F (a) .
Physics Properties Of Matter Level: High School
Newly refined gasoline (p = 0,70 * 10 to the third Kg/m cubic ) is being pumped from the refinery into storage tank 15 m above the pump . At the pump , a pressure gauge reads 2.7 * 10 to the fifth Pa and a rate meter reads 2.5 m/s .a) Is a pressure gauge at eh storage tank reads 1.4 * 10 to the fifth Pa , use Bernoulli’s Law to find the gasoline speed as it enters the tank .
b) Use equation of sontinuity to determine the ratio of the pipe system’s cross-sectional are at the pump to that at the tank .
c) Do we have enough information to find the mass flow rate ? If not , explain why if so, calculate it .
Physics Work,Power & Energy Level: High School
An elevator has a mass of 1200 kg and carries a maximum load of 793 kg . A constant frictional force of 4980 N retards its motion upward . The acceleration of gravity is 9.8 m/s2 . What power must the motor deliver at an instantaneous speed of 4.96 m/s if the elevator is designed to provide upward acceleration of 0.794 m/s2 ? Answer in units of W .
Physics Work,Power & Energy Level: High School
A child pushes horizontally on a box of mass m which moves with constant speed v across a horizontal floor . The coefficient of friction between the box and the floor is mu . At what rate does the child do work on the box ?a) P = mu mg v
b) P = mu mg / v
c) P = mu m vsquared
d) P = v/mu mg
e) P = mgv
Physics Work,Power & Energy Level: High School
Shawn and his bike have a total mass of 43.3 kg . Shawn rides his bike 0.54 km in 17.5 min at a constant velocity . The acceleration of gravity is 9.8 m/s2 . What is the Shawn’s kinetic energy ? Answer in units of J .