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A certain laser outputs pure blue light (photon energy 3.1 eV) with power 400 milliwatts (0.4watts). How many photons per second does this laser emit? The answer should be in photons/secs.
A pulse from a ruby laser (lambda = 694.3 nm) has an average power of 20 MW and lasts 2.3 ns. What is the total energy of the pulse
A circuit is pulled with a 16N force toward the right to maintain a constant speed v. What is the direction of the induced current
A researcher would like to perform an experiment in a zero magnetic field, which means that the field of the earth must be cancelled. What current is needed in the solenoid's wires
assume that the tale applies a constant force of friction of 0.5 N block. if the block compresses the spring by 3cm after hitting it, what was the speed of the ball(hit spring)
The intensity of the sound wave from a jet airplane as it is taking off is 105 W/m2 at a distance of 3.2 m. What is the intensity of the sound wave
There is no difference between the static charges generated by rubbing rods with fur or silk and the charges that flow(from battery) through wires in an electric circuit. Why there is no difference?
The intensity of solar radiation at the earth's orbit is about 1360 W/m2. Using 1.5 × 1011 m for the distance from the earth to the sun, calculate the total power radiated by the sun
find out the magnitude of force exerted on the lower end of the boom by the hinge.
The cliff divers of Acapulco push off horizontally from rock platforms about 35m above the water, What minimum pushoff speed is necessary to clear the rocks
If the radius of the equipotential surface of point charge is 13.5 m at a potential of 2.10 kV, what is the magnitude of the point charge creating the potential
At the surface, atmospheric pressure is 1.013 X 10^5 Pa. What is the additional pressure on the air in their lungs
Two friends are carrying a crate of mass 200 kg up a flight of stairs. The crate has length 1.25 m and height 0.500 m, What is the magnitude of the upper person's force
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