Answer:
see below
Explanation:
a. 0.1886 x 12
=2.2632
This has 2 sig figures so the answer can only have 2 sig figures
2.3
b. 2.995 - 0.16685
=2.82815
The most accurate in the problem is to thousands place so our answer can only be accurate to the thousands place
2.828
c. 910 x 0.18945=172.3995
The  least number of significant figures is 3 so the answer can only have 3 significant figures
172
 
        
             
        
        
        
Answer:
I just took the quiz and got 100% when choosing A.Conservation. Hope this helps:)
 
        
                    
             
        
        
        
Answer:  the most potential energy ==  5 kg book, 2 m from the ground= 98 Joules
Explanation:
potential energy = m g h 
m = mass 
g = acceleration due gravity  = 9.8 m/s²
h = distance above  ground 
1.  Pe₁ = 1 kg x 2 m x g  = 2 g 
2. Pe₂ = 5 kg x 2 m x g = 10 g = 10 kg m x 9,8 m/s² = 98 Joules
3. Pe₃ = 1 kg x 0,5 m x g = 0,5 g 
4. Pe₄ = 5 kg x 0.5 m x g = 2,5 g  
10 > 2,5 > 2 >0,5 
 
        
             
        
        
        
Answer:
a) 
 m/s
 m/s
b)  
Angular frequency =  
Explanation:
As we know 

q is the charge on the electron =  C
 C
B is the magnetic field in Tesla =  T
 T
r is the radius of the circle =  m
 m
mass of the electrons =  Kg
 Kg
a) 
Substituting the given values in above equation, we get - 
 m/s
m/s
b)  
Angular frequency =
 