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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 2.50 centimeter and the index of refraction of the polymer is n = 1.70, explain how thick would you make the coating? (Suppose that the index of refraction of the plane is higher than that of the coating.)
Using the equation F=m v^2/r for a force an object in circular motion. Find the radius r of motion of a m=1.6 kg ball travelling in a circular path acted upon by a centripetal force F=7N.
a 2190 kg car moving east at 10.4 ms collides with a 3170 kg car moving east. the cars stick together and move east as
In a belly-flop diving contest, the winter is the driver whomakes the biggest splash upon hitting the water. The size of thesplash depends not only on the drivers style, but also on theamount of kinetic energy that the driver has.
a metal sphere of radius 19 cm has a net charge of 6.0 10-8 c.a what is the electric field at the spheres surface?b if
A Pyrex flask in a refrigerator at 1?C is filled to the top and holds exactly 1000 cm3 of ethyl alcohol. If the refrigerator fails, how much alcohol spills by the time the temperature reaches 28?C
Two cars are travelling on a desert road. After 5s, they are side by side at the next telephone pole. The distance between the poles is 70m.
assume a ball is launched from ground level with initial velocity magnitude v. the ball travels a horizontal distance d
A flight attendant pulls her 70.10 N flight bag a distance of 258 m along a level airport floor at a constant speed. The force she exerts is 36.30 N at an angle of 52.0° above the horizontal.
about 0.1 ev is required to break a hydrogen bond in a protein molecule. calculate the minimum frequency and maximum
An astronaut exploring a distant solar systems lands on an unnamed planet with a radius of 3900 kilometer. evaluate what is the mass of the planet
A satellite is found to be in an orbit about Planet X such that the period of the orbit matches the rotational period of the planet about its axis, namely 25.2 days. find at what distance from the center of the planet is the satellite orbiting
A 1.80-kg object attached to a spring moves without friction (b = 0) and is driven by an external force given by the expression F = 6.00sin(2?t), Find the resonance angular frequency of the system
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