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A proposed "star wars" antimissile laser is to focus 2.3 µm wavelength infrared light to a 50 cm diameter spot on a missile 2400 km distant. Discover the minimum diameter for a concave mirror that can achieve this spot size, given the diffraction limit. Your answer suggests one of the many technical difficulties faced with antimissile defence systems.
A 7.01- g bullet is moving at 563.00 m/s as it leaves the 0.58- m-long barrel of a rifle. What is the average force on the bullet as it moves down the barrel
A 106g Frisbee is 18cm in diameter and has half its mass spread uniformly n the disk and the other half concentrated in the rim. What is the Frisbee's rotational inertia
A 900 kg car travelling east at 15 m/s collides with 750 kg travelling north at 20 m/s. what is the speed of the wreckage
Lens Maker: Compute the focal length of a lens from its index of refraction and radii of curvatures of the two refracting surfaces. If the index of refraction of the glass utilized is 1.50, one surface is concave and has a radius of curvature of 13.4..
A burglar alarm in a house emits sound at a fixed frequency of 3.1 kHz. On a windy day a person cycles past the house while the alarm is sounding. What frequency does the cyclist hear
What are the advantages of placing capacitors in parallel?What are the disadvantages? What are the advantages of placing capacitors in series? Whatare the disadvantages?
50kg ball tied to the end of a 1.3m light cord is revolvedin a horizontal plane with the cord making a 30 degree angle with the vertical
mixing water 1. 460 cm3 of water at 83degc is mixed with 115 cm3 of water at 8degc. calculate the final equilibrium
the wire unwinds without stretching or slipping, causing the pulley to rotate. Explain how far must the stone fall so that the pulley has 2.70 J of kinetic energy?
safety rules indicate that a ladder placed against a building should noever be further away from the building than 14
A point source of white light is located 3 meters from the lensin the previous problem, on its axis. what is the diameter of the smallest overall image of the pointsource that the lens creates
White light is incident on a soap film (n = 1.30) ubaur, What is the minimum thickness of the soap film
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