C light energy
The solar energy from the sun converts to chemical potential energy
Answer:
For H2O, there is one atom of oxygen and two atoms of hydrogen. A molecule can be made of only one type of atom. In its stable molecular form, oxygen exists as two atoms and is written O2. to distinguish it from an atom of oxygen O, or ozone, a molecule of three oxygen atoms, O3.
Explanation:
Answer:
Explanation:
Machines simply make work easier to do. They increase the amount of force exerted on a body and also the distance through which the force is applied. Also, they can also change the direction through which force on them is applied in order to produce much more work.
Work done = force x distance
The input force in a machine is attenuated to yield even more force. This is the purpose of designing a simple machine. When the force increases, more work would be produce with our little effort applied on the body.
Work done is a function of the force applied on a body and the distance through which it moves.
Answer: The required distance is given by
Explanation: The sound intensity in dB is given by the formula
where 
is the hearing threshold in absolute units and 
is the absolute intensity of the sound which depends on the distance. In general, for two distances 
and 
we have that
Now let us take 
and let be the required distance. We have
Exponentiating these equations we obtain
Dividing them
Using the previously stated identity
Now if we use the given example where 
we have
