It has changed because earlier in the days people couldn't even figure out if the world was flat or round but now we can add decimals and multiply fractions.
<span>Heat energy is transferred from warmer objects to cooler objects.
</span>
Answer:
r = 5.08 m
Explanation:
The electric force of attraction or repulsion is given by :

We need to find how far above the electron would the proton have to be if you wanted to hold up an electron against the force of gravity by the attraction of a fixed proton some distance above it.
So, the force from the proton is balanced by the mass of the electron.

r is distance

So, proton have to be at a distance of 5.08 meters above the electron.
Do u have the statements ?
<h2>

</h2>
<u>Air pressure has no effect at all in an ideal gas approximation. This is because pressure and density both contribute to sound velocity equally, and in an ideal gas the two effects cancel out, leaving only the effect of temperature. Sound usually travels more slowly with greater altitude, due to reduced temperature.</u>