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An AM radio station operating at a frequency of 920 kHz radiates 260 kW of power from its antenna.
How many photons are emitted with the antenna every second? N =_____photons/s
According to legend, to determine whether the king's crown was made of pure gold, Archimedes measured the crown's volume by find out how much water it displaced. The density of gold is 19.3g/cm^3. If the crown's mass was 6.00 * 10^2g, what volume ..
A sphere of radius R has a charge Q. The electric field strength at a distance r > R is Ei. What is the ratio Ef/Ei of the final to first electric field strength if Q is halved.
Light travelling through air enters a certain liquid at an angle of incidence of 43 degrees. What is the index of refraction of the liquid
The angle is 40 degrees and the length is 7.50 m, If the seat weighs 205 N and a 866-N person is sitting in it, find the tension in the inclined cable
charges of 6.0 x 10-7 c are each located at three corners of a square that is 1.0 m on each side. a charge of -1.3 x
A 2.20 sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as heart beats. The reflected sound is after that mixed with the transmitted so..
A child's helium-filled balloon escapes at sea level and22oC. When it reaches an altitude of 4000 m, what is the ratio of the initial volume to the final volume
A pail of water is rotated in a vertical circle of radius1m, what two external forcces act on the water in the pail
The current in a 1.70mm Ã? 1.70mm square aluminum wire is 1.80A. compute the electron drift speed
Consider a bird that flies at an average speed of 10.7m/s and releases energy from its body fat reserves at an average rate of 3.70W, How far will the bird fly before feeding again
Find out the net force exerted on the fluid inside the box by summing momentum flow rates out through each of four sides of the box.
What must be the temperature of the cold reservoir in order to increase the efficiency to 29.0%
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