Шада и я тебя понимаю с чего начать с того ни другого человека дал в долг у меня в здоровье
        
             
        
        
        
Answer:
your answer is B. The velocity could be in any direction, but the acceleration is in the direction of the resultant force
 
        
             
        
        
        
Answer:
 the correct answer is option C which is 50 units.
Explanation:
given,
two vector of magnitude = 30 units and of 70 units
to calculate resultants vector = \sqrt{a^2+b^2+2 a b cos\theta}
cos θ value varies from -1 to 1
so, resultant vector 
= 
 
a = 30 units    and  b = 70 units
=  
 
=   40 units to 100 units
hence, the correct answer is option C which is 50 units.
                        
 
        
             
        
        
        
Answer:
F = 147,78*10⁻⁹ [N]
Explanation:
By symmetry the Fy components of the forces acting on charge in point x = 0,7 m canceled each other, and the total force will be twice Fx ( Fx is x axis component of one of the forces .
The angle β  ( angle between the line running through one of the charges in y axis and the charge in x axis) is
tan β  =  0,5/0,7
tan β  = 0,7142    then   β = arctan 0,7142      ⇒   β = 35 ⁰
cos  β = 0,81 
d = √ (0,5)²  +  (0,7)²       d1stance between charges
d = √0,25 + 0,49
d =  √0,74  m
d = 0,86  m
Now Foce between two charges  is:
F  = K* q₁*q₂/ d²      (1)
Where  K  = 9*10⁹ N*m²/C²
q₁  =  2,5* 10⁻⁹C
q₂  = 3,0*10⁻⁹C
d²  = 0,74 m²
Plugging these values in (1)
F  =  9*10⁹* 2,5* 10⁻⁹*3,0*10⁻⁹ / 0,74       [N*m²/C²]*C*C/m²
F = 91,21 * 10⁻⁹   [N]
And  Fx  =  F*cos  β
Fx  =  91,21 * 10⁻⁹ *0,81
Fx =73,89*10⁻⁹  [N]
Then total force acting on charge located at x = 0,7 m is:
F = 2* Fx
F = 2*73,89*10⁻⁹  [N]
F = 147,78*10⁻⁹ [N]
 
        
             
        
        
        
Answer:
High energy waves have high amplitudes
Explanation:
The sound is perceived as louder if the amplitude increases, and softer if the amplitude decreases. ... The amplitude of a wave is related to the amount of energy it carries. A high amplitude wave carries a large amount of energy; a low amplitude wave carries a small amount of energy