KE = (1/2)·(mass)·(speed)² 
KE = (1/2)·(50 kg)·(18 m/s)²
KE = (25 kg)·(324 m²/s²)
KE = 8,100 kg-m²/s²
KE = 8,100 Joules
        
                    
             
        
        
        
Answer:
K = 960 J
Explanation:
Given that,
Mass of a child = 20 kg
Mass of a sled = 10 kg
Speed of child on sled = 8 m/s
We need to find the kinetic energy of the sled with the child.
The total mass of child and the sled = 20 kg + 10 kg
= 30 kg
The formula for the kinetic energy of an object is given by :

Hence, the kinetic energy of the sled with the child is 960 J.
 
        
             
        
        
        
Answer:
Explanation:
any law stating that some quantity or property remains constant during and after an interaction or process, as conservation of charge or conservation of linear momentum.
 
        
                    
             
        
        
        
Answer:
The induced voltage in the Secondary is 18 volt.
Explanation:
Given that,
Voltage = 120 volt
Number of turns in primary = 500
Number of turns in secondary = 75
We need to calculate the induced voltage in the Secondary
Using relation number of turns and voltage in primary and secondary

Where,  = Number of primary coil
 = Number of primary coil
  = Number of  secondary  coil
 = Number of  secondary  coil
  = Voltage of primary coil
 = Voltage of primary coil
  = Voltage of primary coil
 = Voltage of primary coil
Put the value into the formula



Hence, The induced voltage in the Secondary is 18 volt.
 
        
             
        
        
        
Answer:
<em>F=8.87 N</em>
Explanation:
<u>Coulomb's Law
</u>
The electrostatic force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between the two objects.
Written as a formula:

Where:

q1, q2 = the objects' charge in coulomb
d= The distance between the objects  in meters
Object 1 has a charge of 

Object 2 has a charge of 

They are separated by a distance of
d = 0.099 m
Calculate the force:

F=8.87 N