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Question: A half-wave dipole TV broadcast antenna transmits 1 kW at 50 MHz. What is the power received by a home television antenna with 3 dB gain if located at a distance of 30 km?
A circular coil with N loops and area A rotates with frequency f about a diameter as axis. What is the Average torque must be applied to keep the coil in steady motion
At a certain location, the horizontal component of the earth's magnetic field is 4.90 10-5 T, due north. A proton moves eastward with just the right speed, so magnetic force on it balances its weight. Find the speed of the proton.
Charges +Q and +3Q are separated by a distance 2m. Find the location and value of the third charge in terms of Q
A 60Co source is labeled 4.00 mCi, but its present activity is found to be 1.85 x 107 Bq. (a) What is the present activity in mCi? (b) How long ago did it actually have a 4.00-mCi activity?
A 528 Hz sound wave travels through a substance. What is the speed of sound in the substance
In 1911, Ernest Rutherford discovered the nucleus of the atom by observing the scattering of helium nuclei from gold nuclei. If a helium nucleus with a mass of 6.68 10-27 kg.
An in compressible fluid is flowing through a pipe with a constriction. The wide section is 2.00 cm in diameter and is at the top of the pipe. What is the diameter of the narrow section for the pressure of the fluid in the narrow section to equal t..
When monochromatic light shines perpendicularly on a soap film(n = 1.33) with air on each side, the second smallestnonzero film thickness for which destructive interference ofreflected light is observed is 386 nm. What is the vacuum wavelength of the..
How many 30 watt lamps can you attach to a series circuit of four D-cell batteries (each at 1.5 volts) combined to deliver a current of 13 amperes?
A 57 kg rock with a volume of 36 L is completely submerged in water. The density of water is 1 kg/L. What volume of water is displaced by the rock
The bremsstrahlung x-ray spectrum of both Moand W cut off (have zero intensity) at about 0.035 nm. X rays with this wavelength are produced by the target element when bombarding electrons are promptly stopped in a single collision and give up all ..
Using a highly sensitive parabolic sound collector, Amy records the frequency of a tuning fork as it drops into the Grand Canyon. She drops the vibrating tuning fork from rest at t=0. She records a frequency of 1657.0 Hz at t=6.400 s.
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