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Question: In x-ray machines electrons are accelerated through 100kV or more. What is the speed of a 100keV electron? What is its momentum? How much error do you make in your answers if you use the Newtonian equations instead of the relativistically correct ones?
The circuit in the figure below consists of wires at the top and bottom and identical metal springs in the left and right sides. estimate the magnitude of the magnetic field
A 10,000 kg railroad car is rolling at 2 m/s when a 400 kg load of gravel is suddenly dumped in. What is the railroad cars speed just after the gravel is dumped in.
A LASIK vision correction system uses a laser that emits 10 -long pulses of light, each with 2.5 of energy. The laser is focused to a 0.90 -diameter circle. What is the average power of each laser pulse
an electric dipole p of magnitude 25 p c bull m makes an angle of 65ordm with a uniform electric field e of magnitude
A student was given two forces and asked to find a single force that would produce equilibrium with the two forces. The two forces were given by providing one of the components and the angle the force made with the positive x axis. The two forces ..
A radio antenna broadcasts a 1.0 MHz radio wave with 29 kWof power. Assume that the radiation is emitted uniformly in all directions. (a) What is the wave's intensity 35 km from the antenna? I=___?___W/m^2 (b) What is the electric field amplitude at ..
Catapults date from thousands of years ago, and were used historically to launch everything from stones to horses. Through a battle in what is now Bavaria, inventive artillerymen from the united German clans launched giant spaetzle from their catapul..
how many sprints from rest to a speed of 5.7 ms would a 56-kg woman have to complete to burn off 5.0 x 102 calories?
The two 0.50 kilogram weights of a cuckoo clock descend 1.5 meter in a three-day period. Find at what rate is their total gravitational potential energy decreased
An astronaut exploring a distant solar systems lands on an unnamed planet with a radius of 3900 kilometer. evaluate what is the mass of the planet
a bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.0 m long. the bowler hears
A toroid of mean radius 28 cm and circular cross section of radius 2.3 cm is wound with a superconducting wire of length 1000 m that carries a current of 430 A. What is the number of turns on the coil
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