Physics, 14.12.2019 02:31 bluewhisper
A4.5 kg box slides down a 4.3-m-high frictionless hill, starting from rest, across a 2.0-m-wide horizontal surface, then hits a horizontal spring with spring constant 510 n/m. the other end of the spring is anchored against a wall. the ground under the spring is frictionless, but the 2.0-m-long horizontal surface is rough. the coefficient of kinetic friction of the box on this surface is 0.22. what is the speed of the box just before reaching the rough surface? what is the speed of the box just before hitting the spring? how far is the spring compressed? including the first crossing, how many complete trips will the box make across the rough surface before coming to rest?
Answers: 1
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The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?
Answers: 1
A4.5 kg box slides down a 4.3-m-high frictionless hill, starting from rest, across a 2.0-m-wide hori...
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