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A laser emits a cylindrical beam of light 2.5 {\rm mm} in diameter.If the averagepower of the laser is 2.2 {\rm mW}, what is the rms value of the electric field in the laser beam?
A man with mass m1 = 56 kg stands at the left end of a uniform boat with mass m2 = 179 kg and a length L = 3 m. What is the location of the center of mass of the system
suppose a photon is equally likely to be found anywhere in an interval of 18.6 cm along the x-axis. what is the minimum
a block of mass 12.0 kg is connected to a spring on a horizontal frictionless surface. write the expression for the position of the block as the function of time
A 4.0-m-long iron bar of uniform cross section is held perpendicular to the wall by a wire from the end of the bar to the wall. what is the magnitude of the vertical component of force produced by the wall
a proton in the upper atmosphere moves at 8.4times105 ms perpendicular to earths magnetic field which at that point
Four identical charges (+1.9 ?C each) are brought from infinity and fixed to a straight line. Determine the electric potential energy of this group
An experimental flywheel, used to store energy and replace an automobile engine, is a solid disk of mass 211 kg and radius 0.380 m. What is its rotational inertia? When driving at 20.6 m/s (46.1 mph), the fully energized flywheel is rotating at an..
The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string remains fixed. Find out the maximum speed the stone can attain without breaking the string.
The statement is: the effects of scaling are good for some creatures and bad for others. I understand the effect of scaling on cubes and the fact that smaller cubes have great surface-area-to-volume ratios.
A 10-cm solid wooden cube is floating on the surface of water. Its height above water is 3.0cm. What is the buoyant force on the cube
The heating element of a simple heater consists of a 1.9-m-long, 0.65-mm-diameter nichrome wire. What is the wire's resistance when it is hot
Comets move around the sun in very elliptical orbits. What was the comet's speed when it crossed Neptune's orbit in 2006
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