Energy in a spring:
E = 0.5 * k * x²
k spring constant = 800 n/m
x stretch of the spring = 5 cm = 0.05 m
E = 0.5 * 800 * 0.05² = 1
        
             
        
        
        
Answer:
option D
Explanation:
given,

increase the intensity by factor of 9
     I₁ = I₀
     I₂ = 9 I₀
 now,
 
 
 
 
       A₂ = 3 A₁
hence, amplitude increase with the factor of 3
so, the correct answer is option D
 
        
                    
             
        
        
        
Answer:
 3500N
Explanation:
Given parameters: 
Mass of driver  = 50kg
Speed  = 35m/s 
Time  = 0.5s 
Unknown: 
Average force the seat belt exerts on her = ? 
Solution: 
The average force the seat belt exerts on her can be deduced from Newton's second law of motion. 
    F = mass x acceleration 
 So; 
      F  = mass x  
   F  = 50 x  = 3500N
    = 3500N
 
        
             
        
        
        
Answer:
An ultra intense laser is one with which intensities greater than 1015 W cm-2 can be achieved.
Explanation:
This intensity, which was the upper limit of lasers until the invention of the Chirped Pulse Amplification, CPA technique, is the value around which nonlinear effects on the transport of radiation in materials begin to appear.
Currently, the most powerful lasers reach intensities of the order of 1021W cm-2 and powers of Petawatts, PW, in each pulse. This range of intensities has opened the door for lasers to a multitude of disciplines and scientific areas traditionally reserved for accelerators and nuclear reactors, applying as generators of high-energy electron, ion, neutron and photon beams, without the need for expensive infrastructure.
 
        
                    
             
        
        
        
Answer:
The Mitochondria generates most of the chemical energy needed to power the cell's biochemical reactions.
Explanation:
I studied the body organisms 2 years ago.