a. The force applied would be equal to the frictional
force.
F = us Fn
where, F = applied force = 35 N, us = coeff of static
friction, Fn = normal force = weight
 
35 N = us * (6 kg * 9.81 m/s^2)
us = 0.595
 
b. The force applied would now be the sum of the
frictional force and force due to acceleration
F = uk Fn + m a
where, uk = coeff of kinetic friction
 
35 N = uk * (6 kg * 9.81 m/s^2) + (6kg * 0.60 m/s^2)
uk = 0.533
 
        
             
        
        
        
Well they could go down a hill to gain more kinetic energy.
        
                    
             
        
        
        
Answer:
v = 12.12 m/s
Explanation:
Given that,
The mass of the cart, m = 75 kg
The roller coaster begins 15 m above the ground.
We need to find the velocity of the cart halfway to the ground. Let the velocity be v. Using the conservation of energy at this position, h = 15/2 = 7.5 m

So, the velocity of the cart is 12.12 m/s.
 
        
             
        
        
        
Answer:
Number of turns per unit length will be 
Explanation:
We have given that strength of the magnetic field produced by the solenoid B = 7 T
Current in the solenoid i = 200 A 
Let the number of turns per unit length is n 
Magnetic field due to solenoid is given as  here
 here  is permeability of free space n is number of turns per unit length and i is current
 is permeability of free space n is number of turns per unit length and i is current 
So 

 
        
                    
             
        
        
        
This behavior helps Betty in <u>intellectual  </u>development.