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A shielding enclosure with no apertures has a shielding effectiveness of 100 dB at 100 MHz. Determine the shielding effectiveness of the enclosure, at 100 MHz and at 200 MHz, if 20 closely spaced, equal size apertures were cut into one of its panels. Each of the apertures would have a maximum dimension of 3 cm.
A spaceship has two engines oriented perpendicularly (inxandydirections). The ship is initially at rest. One engine fires and gives the rocket an accelerationax = 5 m/s2. At the same time, the other engine fires and gives the rocket an accelerationay..
X-rays of wavelength 0.140 nm are scattered from a crystal, What is the interplanar spacing for this crystal
A professor walks in a long hall carrying a vibrating 512Hz tuning fork. The end of the hall is closed so that sound reflects from it. The student hears 4 beats per second. How fast is the student walking and in what direction.
A man stands in a stationary canoe and throws a 5.00 kilogram stone with a velocity of 8.10 m/s at an angle of 28.0 degree above the horizontal. determine the horizontal recoil velocity (direction and magnitude) of the canoe
Ten boxes, each 21.0 cm high and weighing180 N, initially are all side by side onthe floor. The boxes are lifted and placed in a vertical stack2.10 m high in a time interval of6.50 s. Compute the power necessary tostack the boxes.
In measuring an RL circuit, you find that the total resistance of the circuit is 60 ohms and that t1/2 is 0.000836 seconds. Find the inductance of the circuit
A circular coil of 15 turns and area 4.0 cm^2 carries a current of 1.2 A. What is the resultant force acting on this coil
A canoe has a velocity of 0.54m/s southeast relative to the earth. The canoe is on a river that is flowing at 0.52m/s east relative to earth.
an inductor that has a resistance of 40 ohm is connected to an ideal battery of 224V. Calculate the inductorace
A pendulum swings in a lab room by a period of 2 seconds. You place that same pendulum on the top of a vertical pole and it swings by a period of 3 seconds. How high is the pole? Now you place that same pendulum in a cavity at the center of earth, wh..
A lens with a focal length of 25 cm and a concave mirror with a radius of curvature of 100 cm are placed 1.0 meters apart. determine if it is real or virtual
Fully stripped (all electrons removed) oxygen (16O) ions are accelerated from rest in a particle accelerator using a total potential difference of 10.0 MV. What is the current of the ion beam, iion, which is the total charge passing per each second
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