Answer:
B)8 
Explanation:
In the first energy level you can have, at most, 2. Every energy level after that wants to have 8 electrons. Valence electrons I believe.
Hope this helps, have a nice day! (^-^)
 
        
                    
             
        
        
        
Answer: force = mass x accelegation
Explanation: 15x3 = 45 N
 
        
                    
             
        
        
        
The amount of energy required to raise the temperature of one gram of water by one celsius degree is called a calorie. 
<h3>How can you define calorie?</h3>
In physics, we can define it as a unit of measurement that defines the amount of energy to raise the temperature of 1 gram  of water by 1°C. Each material has its unique calorie, however by definition we use water as it is the lowest of all the elements.
Normally, calorimetry is directly linked with the thermal capacity that an element has to contain heat.
See more about calorie at brainly.com/question/22374134
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Answer:
Change in mechanical energy = work done by friction
so it is equal to

Explanation:
As we know that change in mechanical energy must be equal to the work done by non conservative forces only
So here when block moves down the inclined plane then the work done by friction force is given as

here we have

here we know that

so we have


Now the friction force on the block is given as



now work done by the friction is given as


 
        
             
        
        
        
Answer:
(a) Initial volume will be 7.62 L 
(b) Final temperature will be 303.85 K
Explanation:
We have given one mole of ideal gas done 3000 J 
So work done W = 3000 J
Let initial volume is  and initial pressure
 and initial pressure  ( As pressure is constant )
 ( As pressure is constant )
Final volume  = 0.025
 = 0.025 
Number of moles n = 1
(B) From ideal gas of equation we know that 
So 
T = 303.85 Kelvin 
(B) For isothermal process work done is equal to 





So initial volume will be 7.62 L