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Light travles between a medium of index n=1.52 and a medium of index n1=1.38. What is the critical angle for this combination? Does light have to travel from high index to low index, or from low index to high index, in order to have total internal reflection? What is the speed of light in the low index medium?
Let's build a helium atom. Start with a nucleus with 2 protons and 2 neutrons, Calculate the energy gained by the system constructing this atom
A 20.0-N block rests on a horizontal surface. The coefficients of static and kinetic friction between the surface, What is the force of friction acting on the block
Two police cars have identical sirens that produce a frequency of 560 Hz. Find the speed of the approaching police car
The mass of mars is 6.419 times 10 26 square kg and the mass of a single proton is 1.673 times 10 negative 27 square kg. assuming mars is made entirely of protons, how various protons would make up mars.
A 4 kg mass is hung from a string which is wrapped around a cylindrical pulley (a cylindrical shell). If the mass accelerates downward at 4.90 m/s2, what is the mass of pulley.
how long does it take for a person to radiate. Calculate the time of flight.
Consider a thin, uniform rod of mass m and length L (and negligible other dimensions) lying on the x axis (from x=-L to 0). Derive a formula for the gravitational ?eld “g” at any arbitrary point x to the right of the origin (but still on the x-axi..
A block of weight 4.5 N is at rest on a horizontal table. An upward vertical force of 2.2 N is applied to the block by means of a string. What is the magnitude of the force exerted by the block
A ball is thrown horizontally from the top of a 60.0-m building and lands 100.0 m from the base of the building. Ignore air resistance. What must have been the initial horizontal component of the velocity
Use Ampere's Law to find the magnetic field due to an infinitely long wire of radius R carrying a current I. Find the magnetic field both inside and outside the wire
Two blocks, each of mass m = 1.4 kg, are pushed along the horizontal surface of a table by a horizontal force P of magnitude 4.7 N, Find the frictional force acting on the upper block
q1. what do superstring theories try to elucidate?a. forces holding super clusters of galaxies togetherb. behaviour of
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