If we have the angle and magnitude of a vector A we can find its Cartesian components using the following formula

Where | A | is the magnitude of the vector and  is the angle that it forms with the x axis in the opposite direction to the hands of the clock.
 is the angle that it forms with the x axis in the opposite direction to the hands of the clock.
In this problem we know the value of Ax and Ay and we need the angle  .
.
Vector A is in the 4th quadrant
So:

So:

So:

 = -47.28 ° +360° = 313 °
 = -47.28 ° +360° = 313 °
 = 313 °
 = 313 °
Option 4.
  
        
             
        
        
        
Answer:
581 kJ, work was done by the system
Explanation:
According to the first law of thermodynamics:

where
 is the change in internal energy of the system
 is the change in internal energy of the system
Q is the heat absorbed by the system (positive if absorbed, negative if released)
W is the work done by the system (positive if done by the system, negative if done by the surrounding)
In this problem,


Therefore the work done by the system is

And the positive sign means the work is done BY the system.
 
        
             
        
        
        
Answer:
An external force is a force that acts on an object within the system from outside the system. This type of force is different than an internal force, which acts between two objects that are both within the system. The net external force combines these two definitions; it is the total combined external force
Explanation:
ig the answer is true
 
        
             
        
        
        
Answer:
gap junctions,tight junctions,and desmosomes
 
        
             
        
        
        
Answer:
Force on the object is 20 N
Explanation:
As we know that work done to raise the book from initial position to final position is known as potential energy stored in it
So here we know that

here we know that
U = 30 J
s = displacement = 1.5 m
so we have

