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A helium-neon laser emits a beam of circular cross section with a radius r and a power P.
(a) Find the maximum electric field in the beam.
(b) What total energy is contained in a length , of the beam?
(c) Find the momentum carried by a length , of the beam.
The average speed of a nitrogen molecule in air is about 6.70*10^2 m/s, and its mass is about 4.68*10^-26 kg. What average force does the molecule exert on the wall
Find the gravitational attraction between two solid lead spheres of 1 kg mass each if the spheres are almost in contact
A car moves horizontally with a constant acceleration of 3 m/s2. A ball is suspended by a string from the ceiling of the car; What angle does the string make with the vertical
What is the rate of change entropy of the first reservoir.
A plane is flying with an airspeed of 266 miles per hour with heading 272.7 deg the wind currents are running at a constant 45.7 miles per hour in the direction 238.6 deg
What is the maximum amount of energy the incident electron can lose in elastically in this collision? What is left over energy of the electron.
A spaceship is observed by a stationary observer to be moving at .6 c. How fast does the laser beam travel relative to the observer
A 23-g bullet traveling 270m/s penetrates a 2.2kgblock of wood and emerges cleanly at 215m/s. how fast does it move after the bullet emerges
The mass per unit length of the cord is 1.24 e-2 kg/m, so the mass of the cord is negligible compared to the mass of block. The cord is being vibrated at a frequency of 167 Hz (vibration source not shown in the drawing).
If the gas pressure and volume both double, what's the change in internal energy, find the internal energy of 1mol of oxygen at 291K and 1.0 atm
The desperate contestants on a TV survival show are very hungry. The only food they can see is some fruit hanging on a branch high in a tree. With what speed does the rock leave the spring
Suppose the plate of a parallel-plate capacitor are 1mm apart and 10cm on a side (square). You then place it in series with a 10 volt battery and a 1000 ohm resistor. How much charge will be stored on the plates
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