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A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. At a distance of 7.00 km from the source, a detector measures the intensity of the wave to be 27.0 µW/m2. What is the peak value of the magnetic field at the detector due to the wave?
What is the average power radiated by the source?
Now the detector is replaced with a perfectly absorbing sheet normal to the incident flux, with surface area 2.00 m2. What is the force on the sheet due to the wave?
You throw a ball straight down from an apartment balcony to the ground below. find the height of the balcony
Calculate the energy of each of the two photons produced from electron-positron pair annihilation when the electron and positron were nearly at rest
Two 3.0 uC charges are placed at (3.0 cm,-2.0 cm) and (-6.0cm, 1.0cm). find the magnitude and direction of force exerted on the test charge
A quasar 10 billion light years from Earth appears the same brightness as a star 5.9*10^4 light years away. How does the power ouput of the quasar compare with that of the star
If the current in the circuit is 0.15 A and the resistances are R1 = 100 ? and R2 = 260 ?, what is the emf of the battery.
A 0.060 kg tennis ball, moving with a speed of 5.50 m/s, has a head-on collision with a 0.090 kg ball initially moving in the same direction at a speed of 3.00 m/s
A water heater pumps water from the basement of a house to a faucet 8.9 meters above. The main water pipe is 5.1 cm in diameter. Calculate the speed of the water as it leaves the pump
A narrow beam of white light is incident at 30? on a 11.0cm -thick piece of glass. What is the index of refraction for deep violet light
A ball rolls horizontally with a speed of 9.0m/s off the edge of a tall platform. what is the height of the platform
A male turkey is moving towards his mate at a speed of 20.0 m/s while gobblng at a frequency of 1800 Hz. what frequency of sound does the stationary hen turkey hear
Consider a commemorative quarter-dollar advertised for sale at $4.98. It has a diameter of 24.3 mm, a thickness of 1.78 mm, and is completely covered with a layer of pure gold 0.149 µm thick.
A 245 kg person lays on board that is supported only on the ends and that has a mass of 12.0 kg. what is the force on either side where the board is supported
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