<span>A chemical change occurs when the bonds between atoms and molecules change, and a new substance forms. This chemical change may or may not be permanent and may or may not physically affect an object. However, it always affects the chemical composition.</span>
Answer:
Part(a): The final angular velocity is 
Part(b): The ratio of the rotational energies is 
,showing the the energy of th system will decrease.
Explanation:
Part(a):
If '
' be the moment of inertia of an object and '
' be its angular velocity then the angular momentum '
' of the object can be written as
If '
' and '
' be the moment of inertia of the two cylinders and '
' and '
' be the initial angular velocity of the cylinders and '
' and '
' be their respective final angular velocity, then from conservation of angular momentum,
Given, 
. From the above expression
Part(b):
Initial kinetic energy
and Final kinetic energy
Substituting the value of 
,
The above expression shows that the ebergy of the system will decrease.
Water can dissolve salt<span> because the positive part of water molecules attracts the negative </span>chloride<span> ions and the negative part of water molecules attracts the positive </span>sodium<span> ions. The amount of a substance that </span>can dissolve<span> in a liquid (at a particular temperature) is called the </span>solubility<span> of the substance.</span>
velocity = traveled distance ÷ time of the traveled distance is seconds
velocity = 600 ÷ 60
velocity = 10 m/s
_________________________________
Kinetic Energy = 1/2 × mass × ( velocity )^2
KE = 1/2 × 60 × ( 10 )^2
KE = 30 × 100
KE = 3000 j
Answer:
something that can be burned to produce heat
Explanation:
Combustion can be defined as an exothermic chemical reaction between physical substances, usually in the presence of oxygen and hydrocarbons to produce heat, light and carbon.
A fuel can be defined as something that can be burned to produce heat.
In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.
