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
 
        
             
        
        
        
Answer:
  v = 344.1 m / s    
  d = 1720.5 m
Explanation:
For this problem we must calculate the speed of sound in air at 22ºC
            v = 331 RA (1+ T / 273)
we calculate
            v = 331 RA (1 + 22/273)
            v = 344.1 m / s
the speed of the wave is constant,
            v = d / t
            d = v t
we calculate
            d = 344.1   5
            d = 1720.5 m
 
        
             
        
        
        
I think the correct answer from the choices listed above is option A. The process of conduction is described by the heat energy is transferred from the land to the air by direct contact. Conduction is the process of heat transfer that happens through the collisions between molecules.
        
             
        
        
        
Answer:

Explanation:
The charge of a single electron is:

If a droplet contains N electrons, then its charge would be:

In this case, the droplet has
N = 6 
electrons, so its total charge is

 
        
             
        
        
        
From the principle of energy conservation, the kinetic energy of the pendulum at 0.5 m is 14.7 J.
<h3>What is a pendulum?</h3>
A pendulum swings back and forth and can be used to show the change of potential energy to kinetic energy and vice versa.
Given that the kinetic energy is converted to the potential energy; the potential energy at 0.5 m is 3 * 9.8 * 0.5 = 14.7 J.
Following the principle of energy conservation, the kinetic energy of the pendulum at 0.5 m is 14.7 J.
Learn more about pendulum:brainly.com/question/14759840
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