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Project Seafarer was an ambitious program to construct an enormous antenna, buried underground on a site about 10000 km2 in area. Its reason was to transmit signals to submarines while they were deeply submerged. Ordinarily, electromagnetic radiations do not penetrate very far into conductors such as seawater. Suppose that the effective wavelength was 3.4*104 Earth radii.
a) What would be the frequency of the radiations emitted?
b) What would be the period of the radiations emitted?
1) What is the velocity of the water in the hose ?
A weather balloon is designed to expand to a maximum radius of 17 m when in flight at its working altitude where the air pressure is 0.034 atm, what is its radius at lift-off
In a carnival they often have a large r = 16 m, cylinder which people stand against the outer wall while it rotates with some velocity, What is the minimum velocity of the cylinder to make someone "stick" to the wall in m/s
Liquid flows into a tank at 10 m^2/s and flows out of the tank at 3m^2/s. Find at what rate (m^3/s) does volume accumulate in the tank, calculate what is the volume of the tank
a 60.0-g object is attached to a horizontal spring with a force constant of 5.0 nm and released from rest with an
Two masses are connected as in the figure, where ?=40.0°, m1=13 kg and the coefficient of kinetic friction between the m2=7 kg object and the plane is ?k=0.25. Find the acceleration reached by the objects
from a fixed point a surveyor locates a pole at 215.6 ft due east and a bulding corner at 358.2 ft at 37.72 degrees
A 3000-kg truck runs into the rear of a 1000-kg car that wasstationary. What was the speed of the truck before the collision
A cricket ball is bowled at a speed of 144 km/hr. suppose the ball diameter is 70 mm and a drag coefficient 0.45, estimate the drag force in newtons which would be acting on the ball.
What is the wavelength of the reflection minimum?
consider a heat pump which is used to cool down a home during the summer. its coefficient of performance in cooling
q1. an electrical generating plant operates at the boiler temperature of and exhausts the unused heat into a nearby
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