This doesnt make sense. 2g<span>Δym is simply an equation. </span>
Acceleration = (change in speed) / (time for the change)
Change in speed = (ending speed) - (starting speed)
Change in speed = (25 m/s) - (5 m/s) = 20 m/s
Time for the change = 20 sec
Acceleration = (20 m/s) / (20 sec)
<em>Acceleration = 1 m/s²</em>
<span>The protons and neutrons are much more massive than the electrons.
</span>
The electrons are simply too small to really change the mass, so they aren't counted.
For the same generic reason that table salt doesn't taste or behave
like the corrosive sodium or the poisonous chlorine that it's made of.
The physical and chemical properties of compounds in general are
very different from the characteristics of any of their constituent
elements in the pure elemental state.
-- Water doesn't act anything like Hydrogen or Oxygen.
-- A candle doesn't act anything like Carbon or Hydrogen.
-- Dry ice doesn't act anything like Carbon or Oxygen.
-- DNA doesn't act anything like Hydrogen, Oxygen, Nitrogen,
Carbon or Phosphorus. (We are lucky.)
<u>Answer:</u>
148.4 J
<u>Explanation:</u>
We are given that the efficiency of a pulley system is 74.2% and we are to calculate the useful work done if we perform 200 J of work
We know that efficiency is basically the measure of how efficient a process is.
The formula of efficiency is given by:
<em>Efficiency = useful energy output / total energy input</em>
So substituting the given values in the above formula:
0.742 = Useful energy / 200 J
Useful energy = 148.4 J
