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A wing produces lift by diverting the flow of air, producing higherpressure below the wind and lower pressure above the wing. Find thelift produced by an airplane wing having an area of 30 squaremeters if the air velocity over the uper and lower surfaces is 80and 70 meters per second, respectively. Assume the density of airis 1.16kg/m3. (Hint: Solve for static pressure above andbelow the wing, using Bernoullis Equation. The coefficent of liftis not needed).
a uniform electric field of magnitude 430 nc pointing in the positive x-direction acts on an electron which is
A charged particle is injected at 143 m/s into a 0.0855-T uniform magnetic magnetic field perpendicularly to the field. What is the charge-to-mass ratio of this particle
A solid sphere rolls without slipping or sliding along a horizontal surface toward an incline. Calculate the kinetic energy of sphere as it rolls along the horizontal surface
suppose there are 500 billion stars in the galaxy. How does your answer change if there are only 110 civilizations instead of 1.2×10^4.
a body moving at 0.500c with respect to an observer disintegrates into two fragments that move in opposite directions
The ground state energy of a harmonically oscillating electron is 1.24 eV. How much energy should be added to the electron to move it to the second excited state.
chlorine has two stable isotopes 35cl and 37cl. chlorine gas which consists of singly ionized ions is to be separated
If a physicist designs a circuit to operate at room temperature where the 100kΩ resistor carries out a current of 1 mA, how could he estimate the minimum size of the resistor
The same object is located at the same distance from two spherical mirrors, A and B. Find the ratio fA/fB of the focal lengths of the mirrors
A unit of area, often used in measuring land areas, is the "hectare", defined as 104m2. An open-pit coal mine consumes 66hectares of land, down to a depth of 23m, each year. What volume of earth, in cubic kilometers, is removed in this time.
Three moles of a monatomic ideal gas are heated at a constantvolume of 2.40 m3. Theamount of heat added is 4.72 103 J. What is the change in the temperature of the gas
A uniform stick d = 1 m long with a total mass of 249 g is suspended vertically from a frictionless pivot at its top end. A wad of putty of mass 26 g is moving horizontally with speed v. It strikes and sticks to the stick at a distance 0.75 m from..
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