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ANTONII [103]
3 years ago
8

Three identical point charges ( 2.0 nc are placed at the corners of an equilateral triangle with sides of 2.0-m length. if the e

lectric potential is taken to be zero at infinity, what is the potential (in v at the midpoint of any one of the sides of the triangle?
Physics
1 answer:
WARRIOR [948]3 years ago
3 0
Try the distance formula if you have the coordinates of the triangle (point to point) make sure they are congruent 
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A spring with a spring constant value of 125 N/m is compressed 12.2 cm by pushing on it with a 215 g block. When the block is re
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Answer:

v = 2.94 m/s

Explanation:

When the spring is compressed, its potential energy is equal to (1/2)kx^2, where k is the spring constant and x is the distance compressed. At this point there is no kinetic energy due to there being no movement, meaning the net energy in the system is (1/2)kx^2.

Once the spring leaves the system, it will be moving at a constant velocity v, if friction is ignored. At this time, its kinetic energy will be (1/2)mv^2. It won't have any spring potential energy, making the net energy (1/2)mv^2.

Because of the conservation of energy, these two values can be set equal to each other, since energy will not be gained or lost while the spring is decompressing. That means

(1/2)kx^2 = (1/2)mv^2

kx^2 = mv^2

v^2 = (kx^2)/m

v = sqrt((kx^2)/m)

v = x * sqrt(k/m)

v = 0.122 * sqrt(125/0.215)        <--- units converted to m and kg

v = 2.94 m/s

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