Answer: W =  J
 J
Explanation: Since the potassium ion is at the outside membrane of a cell and the potential here is lower than the potential inside the cell, the transport will need work to happen.
The work to transport an ion from a lower potential side to a higher potential side is calculated by

q is charge;
ΔV is the potential difference;
Potassium ion has +1 charge, which means:
p =  C
 C
To determine work in joules, potential has to be in Volts, so:

Then, work is


To move a potassium ion from the exterior to the interior of the cell, it is required  J of energy.
J of energy.
 
        
             
        
        
        
The answer is B
second law
        
             
        
        
        
Given parameters: 
Displacement = 8km
Velocity  = 3.8km/h
Unknown:
time  = ? 
Solution: 
Velocity is displacement divided by time. 
   Velocity  =  
  
       Displacement  = velocity x time
Input the parameters: 
               8  = 3.8  x time
  Time  =  = 2.1s
   = 2.1s
The time taken is 2.1s
 
        
             
        
        
        
Answer:
The box will be moving at 0.45m/s. The solution to this problem requires the knowledge and application of newtons second law of motion and the knowledge of linear motion. The vertical component of the force Fp acts vertically upwards against the directio of motion. This causes a constant upward force of 23sin45° to act on the box. Fhe frictional force of 13N also acts vertically upwards and so two forces act upwards against rhe force of gravity resulting un a net force of 0.7N acting kn the box. This corresponds to an acceleration of 0.225m/s². So in w.0s after i start to push v = 0.45m/s.
Explanation:
 
        
                    
             
        
        
        
Answer:
Pe is stored energy to do work Pe is stored in objects that are at rest
KE defined as the energy of motion 
began to move
Not sure about the rest
hope this helps
Explanation: