Answer:
t = 4.21x10⁻⁷ s 
Explanation:
The time (t) can be found using the angular velocity (ω):
 
 
<em>Where θ: is the angular displacement = π (since it moves halfway through a complete circle)</em>
We have: 
 
  
<u>Where</u>:       
<em>v: is the tangential speed </em>
<em>r: is the radius</em>
The radius can be found equaling the magnetic force with the centripetal force:

Where:
m: is the mass of the alpha particle = 6.64x10⁻²⁷ kg
q: is the charge of the alpha particle = 2*p (proton) = 2*1.6x10⁻¹⁹C
B: is the magnetic field = 0.155 T
Hence, the time is:

Therefore, the time that takes for an alpha particle to move halfway through a complete circle is 4.21x10⁻⁷ s.
I hope it helps you!     
 
        
             
        
        
        
I believe the answer is x
        
             
        
        
        
P1v1/t1 = p2v2/t2
p1=475, v1=4, t1=290
v2=6.5, t2=277
solve for p2 in kpa
        
             
        
        
        
B. A copper wire with rubber insulation
        
             
        
        
        
The object will come to a halt.
Resultant force at start:17-10=7 to the left
When additional force is added to the right,it balances the forces acting in the object.
7N to the right and 7N to the left suggests that the object will come to a halt as it is in equilibrium.