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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 balloon ofvolume 2.2 m3 contains argongas at a pressure of 6.3 105 Pa and room temperature (20°C). What is the total internal energy of the gas
A sound wave with intensity 10 mW/m2 interferes destructively with a sound wave that has an intensity of 1 mW/m2. What is the intensity of the superposition of the two
An aluminum rod is 17.0 cm long at 20°C and has a mass of 350 g. what is the change in length of the rod
If an electron makes a transition from the n = 4 Bohr orbit to the n = 3 orbit, determine the wavelength of the photon created in the process
A crate with mass 36.0 initially at rest on a warehouse floor is acted on by a net horizontal force of 142. Explain how far does it travel in 12s and what is its speed at that time?
A coil of 57. turns of wire has a diameter of 9.5 cm and carries 7.2 Amperes. How many Gauss is that
An initially motionless test car is accelerated uniformly to 145 km/h in 8.28 seconds before striking a simulated deer. The car is in contact with the faux fawn for 0.455 seconds, after which the car is measured to be traveling at 60.0 km/h.
A 5.06 10-5 H solenoid is constructed by wrapping 63 turns of wire around a cylinder with a cross-sectional area of 9.70 10-4 m2 , Determine the change in the length of the solenoid
A tennis player standing 12.6 m from the net hits the ball at 2.79° above the horizontal. how fast was the ball moving when it left the racket
An engine absorbs 1.74 kJ from a hot reservoir at 277°C and expels 1.21 kJ to a cold reservoir at 27°C in each cycle. How much work is done by the engine in each cycle
What is a galaxy rotation curve and describe the rotational curve for the Milky Way? How does the shape of the curve indicate the presence of dark matter?
a neat diagram of the connection showing the secondary winding of a 3-phase 4 wire tnt transformer supplying three
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