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How far from a point charge of -7.20 mC must a point charge of +2.30 mC be placed so that the electrical potential energy U of the charge pair is -0.400 J? (Consider U equal to zero when the charges have infinite separation.)
Calculate the minimum amout of work (in joules) required to freeze one liter of water originally at temperature T = 20 degrees celsius
Suppose a photon with a wavelength of 7155 angstroms strikes ahydrogen anion, which has an electron binding energy of .75419eV.Is this sufficient to cause ejection of the electron? If so, whatwill be the kinetic energy and the deBroglie wavelength..
In one design, a large spring with spring constant 2×10^4 N/m was placed behind the cannon. The other end of the spring braced against a post that was firmly anchored to ship's frame.
Vector A has components Ax = 1.39 cm , Ay = 2.30 cm ; vector B has components Bx = 4.20 cm , By = -3.65 cm . Find the components of the vector sum A? +B?.
A 10 nC point charge is at the center of a 2.0m x 2.0m x 2.0 mcube. What is the electric flux through the top surface of the cube
Calculate torques about an axis
Light in a vacuum is incident on a transparent glass slab. Theangle of incidence is 35.6°. What is the index of refraction of the liquid
A contestant in a winter games event pushes a 35.0 kg block of ice across a frozen lake, Calculate the minimum force F he must exert to get the block moving
A communications satellite is in a synchronous orbit that is 3.6 x107 m directly above the equator. The satellite islocated between two cities almost on the equator that are separated by a distance of 3.5 x 106 m.
A helium-neon laser emits a beam of circular cross section with a radius r and a power P. Find the maximum electric field in the beam
A broken-down spaceship (Star Wreck?) flies across an international soccer field, How long does the spaceship pilot measure the field to be
What is the electric field amplitude associated with the light from a laser pointer? Assume a power of 0.20mW with a wavelength of 600 nm
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