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A colinear array of half-wave dipoles is to be used to produce an omnidirectional radiation pattern with a directivity of at least 14 dBi at a frequency of 900 MHz. Calculate the minimum overall length of the array and the 3 dB beamwidth, given that the center-to-center spacing between adjacent antennas is 0.5 wavelengths.
A woman is walking up a mountain trail at a constant speed. Whileshe is walking she ingests a candy bar that supplies 745 Cal ofenergy. The work she does while climbing results in an increase ofgravitational potential energy of 469 Cal.
Get the potential energy of a current-carrying loop in a B field that has a uniform over the face area of the loop. The work an external agent would have to perform to change the orientation of a loop in the B field, originally at rest with the loop ..
The terminal speed of a sky diver is 124 km/h in the spread-eagle position and 338 km/h in the nosedive position. Assuming that the diver's drag coefficient C does not change from one position to the other
An ac source of period T and maximum voltage V is connected to a single unknown ideal element that is either a resistor, an inductor, or a capacitor. At time t=0 the voltage is zero.
q1. two charges are placed on the x axis. one of the charges q1 6.95c is at x1 3.00 cm and the other q2 -27.3c is at
The Big Bang Theory suggests leftover background radiation. Find the wavelength of this radiation
When a water gun is fired while being held horizontally at a height of 1.00 m above ground level, the water travels a horizontal distance of 4.90 m. how far will the water travel horizontally
Monochromatic coherent light shines through a pair of slits. If the distance between these slits is decreased, which of the following statements are true of the resulting interference pattern? (There could be more than one correct choice.)
A child of mass 50.0 kg stands 2.00 m from the center of a horizontal circular disc of radius 4.00 m and mass 200 kg. The disc is mounted on a frictionless, vertical axis. Calculate the angular momentum of the disc
the top of the pool table is 0.710m from the floor. the placement of the tape is such at 0m aligns to the edge of the table. at what speed did his pool ball hit the ground
A boat is to cross a river on a course directed 20.0° north of east in 10 minutes from point A to point B. The distance from point A to point B is 815m. If the river flows at a speed of 3.0 km/hr, at what angle upstream must the boat be headed,..
A steel wire with mass21.8g and length1.6m is strung on a bass so that the distance from the nut to the bridge is 1.10 m. Calculate the tension required to obtain the proper frequency
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