Most of the energy will be absorbed by the materials that make up the cars, causing them to deform. The energy will also be converted into sound energy, causing a loud bang upon collision. Also, some energy will be converted to thermal energy, which will cause the cars to heat up slightly.
        
             
        
        
        
Answer:
A)  B = 5.4 10⁻⁵ T, B) the positive side of the bar is to the West
Explanation:
A) For this exercise we must use the expression of Faraday's law for a moving body
             fem = 
             fem =  - d (B l y) / dt = - B lv
- d (B l y) / dt = - B lv
             B = 
we calculate
              B = - 7.9 10⁻⁴ /(0.73 20)
              B = 5.4 10⁻⁵ T
B) to determine which side of the bar is positive, we must use the right hand rule
the thumb points in the direction of the rod movement to the south, the magnetic field points in the horizontal direction and the rod is in the east-west direction.
Therefore the force points in the direction perpendicular to the velocity and the magnetic field is in the east direction; therefore the positive side of the bar is to the West
 
        
             
        
        
        
Answer
given,
diameter,d₁ = 7.5 cm
                d₂ = 4.5 cm
 P₁ = 32 kPa
P₂ = 25 kPa
Assuming, we have calculation of flow in the pipe
using continuity equation
  A₁ v₁ = A₂ v₂
  π r₁² v₁ = π r₂² v₂
   
   
   
Applying Bernoulli's equation
   
   
   
   
   
        v₂ = 4.01 m/s
 fluid flow rate
 Q = A₂ V₂
Q = π (0.0225)²  x 4.01
Q = 6.38 x 10⁻³ m³/s
flow in the pipe is equal to 6.38 x 10⁻³ m³/s
 
        
             
        
        
        
Answer:
0.52 Nm
Explanation:
A = 0.12 m^2, N = 200, i = 0.5 A, B = 0.050 T
Angle between the plane of loop and magnetic field = 30 Degree
Angle between the normal of loop and the magnetic field = 90 - 30 = 60 degree
θ = 60°
Torque = N i A B Sinθ
Torque = 200 x 0.5 x 0.12 x 0.050 x Sin 60 
Torque = 0.52 Nm