Answer:
Potential energy = 441 N
Explanation:
Given:
Mass M = 15 kg
Height = 3 m
Find:
Potential energy
Computation:
Potential energy = mgh
Potential energy = (15)(9.8)(3)
Potential energy = 441 N
 
        
             
        
        
        
T cells and B cells are similar because they both deal with fighting of viruses.
        
                    
             
        
        
        
Answer:
51.53 grams .
Explanation:
Na₃PO₄    ⇄  3Na⁺¹   +    PO₄⁻³ . 
1 mole           3 mole 
725 mL of 1.3 M Na⁺  ions 
= .725 x 1.3 moles of Na⁺ ions 
= .9425 moles 
3 mole of Na⁺  is formed by 1 mole of Na₃PO₄ 
.9425 mole of Na⁺  is formed by .9425/3  mole of Na₃PO₄ 
Na₃PO₄ needed =  .9425/3  moles = .3142 moles 
Molecular weight of Na₃PO₄ = 164 
grams of Na₃PO₄ needed = .3142 x 164 = 51.53 grams . 
 
        
             
        
        
        
Answer:
Fe₃Si₇
Explanation:
In order to determine the empirical formula, we have to follow a series of steps.
Step 1: Determine the percent composition
Fe: 46.01%
Si: 53.99%
Step 2: Divide each percentage by the atomic mass of the element
Fe: 46.01/55.85 = 0.8238
Si: 53.99/28.09 = 1.922
Step 3: Divide all the numbers by the smallest one
Fe: 0.8238/0.8238 = 1
Si: 1.922/0.8238 = 2.33
Step 4: Multiply by numbers that make the coefficients whole.
Fe: 1 × 3 = 3
Si: 2.33 × 3 = 7
The empirical formula is Fe₃Si₇.
 
        
             
        
        
        
Hello.
The answer is: False
The current theory of the formation of our solar system is that the planets formed more or less in their present orbits and they were made balls of gas but they were never comets captured by the sun. 
Have a nice day