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Two radio antennas are 130 m apart on a north-south line. The two antennas radiate in phase at a frequency of 3.6 MHz. All radio measurements are made far from the antennas. What is the smallest angle, reckoned east of north from the antennas, at which constructive interference of two radio waves occurs?
The largest-caliber antiaircraft gun operated by the German air force during World War II was the 12.8 cm Flak 40. What propulsive force was necessary to attain the muzzle speed
The loaded cab of an elevator has a mass of 3000kg and moves 216-m up the shaft in 23s at constant speed. At what average rate does the force from the cable do work on cab.
A small box of mass 10 kg is placed on top of a large box with a mass 4 times that of the small box. find the magnitude of the frictional force acting on the small box
An electric field of 7.90 x10^5 V/m is desired between two parallel plates, each of area 41 cm2 and separated by 2.45 mm of air. What charge should be on each plate.
Two capacitors, of 3.2 and 4.8?F capacitance, are connected in parallel across a 300 V potential difference. Calculate the total energy stored in the capacitors
A person takes in a breath of 10!C air and holds it until it warms to 37.2!C. The air has an initial volume of 0.73 L, find the work done by the air on the lungs
An RLC circuit has a 400 ohms resistance a 2.5 mH inductor and a capacitor. what is the power dissipated by the circuit
A solid sphere has a temperature of 408 K. The sphere is melted down and recast into a cube that has the same emissivity, What is the cube's temperature
An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50s. what is the average speed of the object
A hunter aims directly at a target (on the same level) 140 m away.
If you had been tasked to remove the water from New Orleans after Hurricane Katrina would you select a radial flow, mixed flow or axial flow pump for this purpose? Explain it briefly.
An experimental airplane is flying northwest from Nashville, at an altitude of 18,000 ft. Determine the lift
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