The first law of thermodynamics states the conservation of energy and heat where the total energy in an isolated system may be transformed into another, but never created or destroyed. If 286 J of energy was released to the room, then also 286 J of energy was also removed from food in that refrigerator assuming it is an isolated system.   :)
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Answer
given,
mass of glider = 0.23 Kg
spring constant = k = 4.50 N/m
spring stretched to 0.130 m
The springs potential energy =
  
  
         U = 0.038 J
at x = 0,the only energy will be kinetic .
  
  
          v² = 0.3304
          v = 0.575 m/s
displacement of the glider 
       using conservation of energy
  
  
  
         x = 0.678 m
 
        
             
        
        
        
Kinematics is the study of the motion of a system of bodies without directly considering the forces or potential fields affecting the motion. In other words, kinematics examines how momentum and energy are shared among interacting bodies.
 
        
             
        
        
        
Answer:
4
Explanation:
We are given that 

K.E at x=0 m=20 J
K.E at x=3 m=11 J
We have to find the value of c.
By work energy theorem 
Work done=Change in kinetic energy 
W=
![W=[\frac{cx^2}{2}-x^3]^{3}_{0}](https://tex.z-dn.net/?f=W%3D%5B%5Cfrac%7Bcx%5E2%7D%7B2%7D-x%5E3%5D%5E%7B3%7D_%7B0%7D)






 
        
             
        
        
        
Tidal, wind, and oil energy are derived from the sun. Nuclear isn't.