Answer:
<u>thermal power stations</u>
Explanation:
these resources are burned to produce the electricity.
 
        
                    
             
        
        
        
Answer:
a)   = 928 J
, b)U = -62.7 J
, c) K = 0
, d) Y = 11.0367 m,  e)  v = 15.23 m / s
 = 928 J
, b)U = -62.7 J
, c) K = 0
, d) Y = 11.0367 m,  e)  v = 15.23 m / s  
Explanation:
To solve this exercise we will use the concepts of mechanical energy.
a) The elastic potential energy is
        = ½ k x²
 = ½ k x²
        = ½ 2900 0.80²
 = ½ 2900 0.80²
        = 928 J
 = 928 J
b) place the origin at the point of the uncompressed spring, the spider's potential energy
      U = m h and
      U = 8 9.8 (-0.80)
      U = -62.7 J
c) Before releasing the spring the spider is still, so its true speed and therefore the kinetic energy also
       K = ½ m v²
       K = 0
d) write the energy at two points, maximum compression and maximum height
      Em₀ = ke = ½ m x²
       = mg y
 = mg y
      Emo = 
      ½ k x² = m g y
      y = ½ k x² / m g
      y = ½ 2900 0.8² / (8 9.8)
      y = 11.8367 m
As zero was placed for the spring without stretching the height from that reference is
      Y = y- 0.80
      Y = 11.8367 -0.80
      Y = 11.0367 m
Bonus
Energy for maximum compression and uncompressed spring
      Emo = ½ k x² = 928 J
       = ½ m v²
= ½ m v²
      Emo =  
      Emo = ½ m v²
       v =√ 2Emo / m
      v = √ (2 928/8)
      v = 15.23 m / s
 
        
             
        
        
        
Answer:No, it doesn't move easily downward because it will try to resist the movement ,due to a resistance force of inertia that it possess at rest.
Explanation:when an object has higher or larger mass it tends to resist any motion given to it unlike the one with lower mass.
The larger the mass the more resistance force an object has.
 
        
             
        
        
        
Answer:

Explanation:
The bike's acceleration can be found by using the following suvat equation:

where
v is the final velocity of the bike
u is the initial velocity
a is the acceleration
s is the distance covered
For the bike in the problem,
u = 0
v = 7 m/s
d = 40 m
Solving the equation for a, we find the acceleration:

 
        
             
        
        
        
Answer:
D IS MY ANSWER N2 TO UREA HOPE ITS HELFUL