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In an experimental technique for treating deep tumors, unstable positively charged pions are aimed to penetrate the flesh and to disintegrate at the tumor site, releasing energy to kill cancer cells. If pions with a kinetic energy of 8.1 keV are required and if a velocity selector with an electric field strength of 2.20 x 103 V/m, what must be the magnetic field strength?
What is the thinnest film of a coating with n = 1.42 on glass (n = 1.52) for which destructive interference of the red component (wavelength = 650 nm) of an incident white light beam in air can take place by reflection?
The central star of a planetary nebula emits ultraviolet light with wavelength 104nm. What is the first-order diffraction angle
A Martian leaves Mars in a spaceship that is heading to Venus. On the way, the spaceship passes earth with a speed v = 0.89c relative to it. Find what is the time of the trip as measured by the Martian
Using a ball that has unknown mass m. You plot your data in the form of f2 versus M/L, with f in rev/s,M in kg, and L in m. calculate the mass m of the ball
What is the period of revolution of a satellite with mass m that orbits the earth in a circular path of radius 8000km (about 1630km above the surface of the earth)?
A 30.0-kg box is being pulled across a carpeted floor by a horizontal force of 230 N, against a friction force of 210 N. Find the x and y components of the acceleration of the box
Bored, a boy shoots his pellet gun at a piece of cheese that sits, keeping cool for dinner guests, on a massive block of ice. obtain the coefficient of friction between the cheese and ice
A uniform circular metal disk has radius 36 cm and mass 350 g and its center is at the origin. Then a circular hole of radius 9 cm is cut out of it. What is the total linear acceleration of a piece metal at the disk's outer edge
A pump uses a piston of 15 cm diameter which moves 2 cm/s. What is the fluid velocity of a tube 3mm in diameter
A mass m attached to a spring with constant k (N/m).
One end of a wire is attached to a ceiling, and a solid brass ball is tied to the lower end. The tension in the wire is 140 N. What is the radius of the brass ball
A projectile projectile is fired at an upward angle of 45o from the top of a 265-m cliff with a speed of 185 m/s. What will be its speed when it strikes the ground below
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