Answer:
a= 17.69 m/s^2
Explanation:
Step one:
given data
A car accelerates uniformly from rest to 23 m/s
u= 0m/s
v= 23m/s
distance= 30m
Step two:
We know that
acceleration= velocity/time
also,
velocity= distance/time
23= 30/t
t= 30/23
t= 1.30 seconds
hence
acceleration= 23/1.30
accelaration= 17.69 m/s^2
 
        
                    
             
        
        
        
Answer: 
False
Explanation: 
Water contains ions that can conduct electricity and if touched it can cause harm (aka electrocution).
 
        
             
        
        
        
Force , F = ma
F =  m(v - u)/t                
Where m = mass in kg, v= final velocity in m/s, u = initial velocity in m/s
t = time, Force is in Newton.
m= 1.2*10³ kg,  u = 10 m/s,  v = 20 m/s, t = 5s
F =  1.2*10³(20 - 10)/5
F = 2.4*10³ N = 2400 N
        
             
        
        
        
The radius of the cylinder is equal to half the diameter:

The volume of the cylinder is given by:

where h is the heigth of the cylinder. Converting into meters,

And the density of the material will be given by the ratio between the mass and the volume:

 
        
             
        
        
        
Answer:
First one, third one, and fourth one