Answer:
Front weels
Explanation:
Because they are the one which select the direction of the car.
 
        
                    
             
        
        
        
I got the 1.0g of coal producves 35,000 joules which is also 8.36 kcals
        
             
        
        
        
Answer:
52.49 Kg
Explanation:
Let m1 and v1 denote your mass and velocity respectively
Let m2 and v2 denote your friends mass and velocity respectively
Kinetic energy is given by
 
  
Since your kinetic energies are the same hence
 
 and making m2 the subject then
 and making m2 the subject then  
 
Since v2 is v1+0.28v1=1.28v1
Substituting m1 for 86 Kg
 
 
        
             
        
        
        
Answer:
5.4 ms⁻¹
Explanation:
Here we have to use conservation of energy. Initially when the stick is held vertical, its center of mass is at some height above the ground, hence the stick has some gravitational potential energy. As the stick is allowed to fall, its rotates about one. gravitational potential energy of the stick gets converted into rotational kinetic energy.
 = length of the meter stick = 1 m
 = length of the meter stick = 1 m 
 = mass of the meter stick
 = mass of the meter stick
 = angular speed of the meter stick as it hits the floor
 = angular speed of the meter stick as it hits the floor
 = speed of the other end of the stick
 = speed of the other end of the stick
we know that, linear speed and angular speed are related as 

 = height of center of mass of meter stick above the floor =
 = height of center of mass of meter stick above the floor = 
 = Moment of inertia of the stick about one end
 = Moment of inertia of the stick about one end
For a stick, momentof inertia about one end has the formula as 

Using conservation of energy 
Rotational kinetic energy of the stick = gravitational potential energy 

 
        
             
        
        
        
The speed of sound depends on the medium in which it is transported.
Sound travels fastest through solids, slower through liquids and slowest through gases. 
So it will travel slowest through water at 55 degrees 
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