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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 145 N. What is the radius of the brass ball?
Light is emitted by a sodium sample that is moving toward Earth with speed v. The wavelength of the light is 589 nm in the rest frame of sample. The wavelength measured in the frame of Earth is 537 nm. Find v.
A copper wire has a 25 m-ohmic resistance at 20 degrees C. When the wire is carrying a current, What is the change in the wire's resistance
One way to measure on another planet or moon by remote sensing is to measure how long it takes an object to fall a given distance. A lander vehicle on a distant planet records the fact that it takes 3.17 for a ball to fall freely 11.26.
The mast of a sailboat is supported at the bow and stern by stainless steel wires, the forestay and backstay, Find the tension in the backstay and the force that the mast exerts on the deck
a particle of mass 2kg moves along axis x through the region in which its potential energy u(x) varies, what force acts on it at this position
A standing wave on a 75.0cm long string has three antinodes. The Wavelength is .50m. If the string has linear mass density 3.78×10?5kg/m and tension 10.5N , what are the wave's frequency
A charge -305e is uniformly distributed over one face of a circular disk of radius 2.90 cm. What is the surface charge density over that face
a thin rod of length 10.3m and mass 20kg is supported at a 30 degree incline. one support is 2.4m and the other is 8.3m from the lower end of the rod, Find the normal force exerted on the rod by the upper support answer in units of N
The magnetic field due to a currnt pulse in a single long, straight axon nerve fiber is 1.2X10^-10T at a distance 0.0013m from axon. What is the current in the axon
Immediately before collision, the linebacker is slipping with a velocity of 8.6 m/s north and the halfback is sliding with a velocity of 7.4 m/s east.
You are making a diffraction grating that is required to separate the two spectral lines in the sodium D doublet, What is the minimum number of lines you should have on the grating
A 4-kg ball traveling to the right with a speed of 4 m/s collides witha 5-kg ball traveling to the left with a speed of 2 m/s. What is the total momentum of the two balls before they collide
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