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A possible means for making an airplane invisible to radar is to coat the plane with an antireflective polymer. If radar waves have a wavelength of 2.70 cm and the index of refraction of the polymer is n = 1.50, how thick would you make the coating? (Assume that the index of refraction of the plane is higher than that of the coating.) cm
The threshold intensity for a human eye to sense the presence of light is 50 photons falling on the retina within a period of 0.1 s. Estimate how far away the star can be away
FM station KCOM transmits simultaneously, at a frequency of 99.9 MHz, from two broadcast towers placed precisely 31.5 m apart along a north-south line. What is the wavelength of KCOM's transmissions
A circle of rope of total mass 1kg and radius 1m is spinning at angular velocity 2.5 rad/sec about an axis through the center of the circle
Though sunlight varies with season and time of day, solar energy falls on United States at an average intensity of 200. Assuming you live in an average location, what total solar-cell area would you need to provide all of your energy needs with en..
You are asked to construct a capacitor having a capacitance near 1 nF and a breakdown potential in excess of 10,000 V, What is the breakdown potential of this capacitor
Compute the magnitude & direction of the current.
A child is sitting on the outer edge of a merry-go-round that is 18m in diameter. if the merry-go-round makes 5 rev/min, what is the velocity of the child in m/s
A 1.6-cm-tall object is 30cm to the left of a lens with a focal length of 15cm . A second lens with a focal length of 42cm is 58cm to the right of the first lens, Calculate the image height
A 20x telescope has a 12-cm diameter objective lens. What minimum diameter should the eyepiece lens have to collect all the light rays from an on axis distant source.
Three forces act on a body which moves with constant velocity. One force is 9 N acting at an angle of 70°, What is the angle of the third force
A permanent dipole is at rest at origin of a coordinate system with a random orientation. What is the equilibrium orientation of the dipole
Suppose that a small incandescent light bulb (R=2.88 kilo ohms) is connected to a standard European household AC electrical socket (240.-V rms voltage and 50.0 Hz frequency). find the average power dissipated by the light bulb
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