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Project Seafarer was an ambitious program to construct anenormous antenna, buried underground on a site about 10000km2 in area. Its purpose was to transmit signals tosubmarines while they were deeply submerged. Ordinarily,electromagnetic radiations do not penetrate very far intoconductors such as seawater. Assume that the effective wavelengthwas 1.3 104 Earth radii.
(a) What would be the frequency of the radiationsemitted?
Hz
(b) What would be the period of the radiations emitted?
s
Two bumper cars moving on a frictionless surface collide elastically. The first bumper car is moving to the right with a speed of 21.5 m/s and rear-ends the second bumper car, which is also moving to the right with a speed of 5.00 m/s. What is the sp..
Consider a rocket which has two combustion rates, ?1 = 4 kg/s and ?2 = 8 kg/s. The relative speed of the exhaust gas is 90 m/s in either case. Determine the final speed of the rocket
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The power dissipated in a series RCL circuit is 66.2 W, and the current is 0.547 A. The circuit is at resonance. Determine the voltage of the generator
A sinusoidal voltage ?v = (85 V) sin (200t) is applied to a series RLC circuit with L = 40 mH, C = 145 ?F, and R = 30 ?. What is the impedance of the circuit
You and your friends are doing physics experiments on a frozen pond that serves as a frictionless, horizontal surface. What was the speed of each person before the collision
In order to study the long-term effects of weightlessness, astronauts in space must be weighed (or at least "massed"). Find the mass of the astronaut
A hollow spherical conductor, carrying a net charge +Q, has inner radius r[1] and outer radius r[2] = 2r[1]. At the center of the sphere is a point charge +Q/2. (a) Write the electric field strength E in all three regions as a function of r.
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