The answer would be hands! hope this helps
        
             
        
        
        
Answer:
false statement : b )  For the motion of a cart on an incline plane having a coefficient of kinetic friction of 0.5, the magnitude of the change in kinetic energy equals the magnitude of the change in gravitational potential energy
Explanation:
mechanical energy = potential energy + kinetic energy = constant 
differentiating both side 
Δ potential energy + Δ kinetic energy = 0 
Δ potential energy = -  Δ kinetic energy
first statement is true. 
Friction is a non conservative force so inter-conversion of potential and kinetic energy is not possible in that case. In case of second  option,  the correct relation is as follows 
change in gravitational potential energy = change in kinetic energy + work done against friction . 
So given 2 nd  option is incorrect. 
In case of no change in gravitational energy , work done is equal to 
change in kinetic energy. 
 
        
             
        
        
        
What do we know that might help here ?
-- Temperature of a gas is actually the average kinetic energy of its molecules.
-- When something moves faster, its kinetic energy increases.
Knowing just these little factoids, we realize that as a gas gets hotter, the average speed of its molecules increases.
That's exactly what Graph #1 shows.
How about the other graphs ?
-- Graph #3 says that as the temperature goes up, the molecules' speed DEcreases.  That can't be right.
-- Graph #4 says that as the temperature goes up, the molecules' speed doesn't change at all.  That can't be right.
-- Graph #2 says that after the gas reaches some temperature and you heat it hotter than that, the speed of the molecules starts going DOWN.  That can't be right.   
-- 
 
        
             
        
        
        
Kinetic Energy =  1/2 * mv²
Kinetic Energy = 14 J,  v = 2.3 m/s ,  m = ?
14  =      1/2 * m* 2.3²
14 = 0.5*m*2.3*2.3
m =  14 / (0.5*2.3*2.3)
m = 5.29 kg.
Mass = 5.29 kg.
        
                    
             
        
        
        
Answer:
gas, metal
Explanation:
The three states of by which hydrogen is found in Jupiter is made up of: 
- Gaseous hydrogen
- liquid hydrogen
- liquid metal hydrogen
This is also the same states found in Saturn too. 
The pressure inside the largest planet in our solar system is very great. 
- Hydrogen and helium makes up the entirety of the planet Jupiter. 
- It has been discovered that inside this planet, hydrogen often occurs as gas, liquid and metal
- This is often attributed to the huge amount of pressure in the planet.