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An airplane can be made invisible to radar by coating the plane with a thin layer of an antireflective material. If radar waves have a wavelength of 3.0 cm, and the polymer has an index of refraction of n = 1.42, how thick would you make the coating? Two glass microscope slides touch on one side. On the other side, a piece of hair is inserted at the far end between the slides, with the long axis of the hair parallel to the edges of the slides. This creates an air wedge between the slides, with one end having a thickness of 0 and the other end having a thickness of the hair, which is 50 microns. How many dark fringes are observed when 600 nm light illuminates the slides from directly above.
A solid aluminum cylinder with density equal to 2700 kg/m3 has the weight equal to 0.66 N in air and the apparent weight of 0.22 N when immersed in an unknown liquid. What is the density of this liquid
Explain how many pellets must be added to 450 g of water that is initially at 20.0°C to make the equilibrium temperature 25.0°C? Neglect any energy transfer to or from the container.
3.00×104 of 300 C steam at a pressure of 20.0 is cooled until it condenses. What is the volume of the liquid water
A length of aluminium wire is connected to a precision 10.00 V power supply, and at 20.0C the current through it is measured precisely to be 0.4212 A. determine the unknown temperature
A parallel plate capacitor has plates of area 2.0x10^-3 m^2 and a plate separation of 1.0x10^-4 m. Determine the capacitance of this system if air fills the volume between the plates.
What is the lamp's resistance? What fraction of the power dissipated is dissipated in batteries.
A 29.0 kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 85.0 N and is directed at the angle of 30.0° above the horizontal. Find out the coefficient of kinetic friction.
A 45.0kg girl is standing on a 170 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.53m/s relative to the plank.
Soft drinks are commonly sold in aluminium containers. How a lot of such containers are thrown away or recycled each year by U.S. consumers.
A 0.150 kg ball is going around in a vertical circle of radius R = 0.300 m at constant speed v. The ball is attached to a mass less ideal string which is attached to a fixed pivot point. If the tension F in the string is greater than 125 N, the st..
If the astronauts in this centrifuge experience a centripetal acceleration 9.0 times that of gravity, what is the linear speed of the capsule
An 82 g arrow is fired from a bow whose string exerts an average force of 95N on the arrow over a distance of 77.00 cm. What is the speed of the arrow as it leaves bow.
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