Physics, 06.10.2019 06:30 ausrin8432
Firemen are shooting a stream of water at a burning building using a high-pressure hose that shoots out the water with a speed of 25.0 m/s as it leaves the end of the hose. once it leaves the hose, the water moves in projectile motion. the firemen adjust the angle of elevation α of the hose until the water takes 3.00 s to reach a building 45.0 m away. you can ignore air resistance; assume that the end of the hose is at ground level.
(a) find α.
(b) find the speed and acceleration of the water at the highest point in its trajectory.
(c) how high above the ground does the water strike the building, and how fast is it moving just before it hits the building?
Answers: 1
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Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?
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