You're right. The molecules in a jar of liquid have a wide range
of different speeds. The average of all of their kinetic energies
is what we sense as the liquid's temperature.
Within the jar, there's conduction and convection going on
constantly. Tiny warm samples conduct heat to the tiny cool
samples next to them, so that the temperature stays uniform
throughout the jar.
When some of the liquid evaporates, it's the fastest molecules that
escaped from the surface and never returned to the jar. With them
went their little bit of kinetic energy, so the total kinetic energy of the
molecules that got left behind decreased slightly, and since it was
the most energetic ones that departed, the average KE of those that
remained also decreased. Once this new average gets uniformly
distributed throughout the jar, it'll show up as a decrease in temperature.
Answer:
Value the person
who gives you time
it's not time, they share
a part of life with you ....
After<span> the </span>hydrogen<span> fuel at the </span>core<span> has been consumed, the </span>star<span> evolves away from the </span>main sequence<span> on the HR diagram. The behavior of a </span>star<span> now depends on </span>its <span>mass, with </span>stars<span> below 0.23 M</span>☉ becoming<span> white dwarfs directly, whereas </span>stars<span> with </span>up<span> to ten solar masses pass through a red giant stage.</span>
Answer:
Fav = -12209 N
Explanation:
let p1 be the initial momentum of the ball and p2 be the final momentum of the ball. let v1 be the initial velocity of the ball and v2 be the final velocity of the ball.
From Newton's second law of motion, we get that the avarage force acting on the ball is given by:
Fav = Δp/t
= (p2 - p1)/t
= m(v2 - v1)/t
= [(145×10^-3)(-45.3 - 38.9)/(1×10^-3)
= - 12209 N
Therefore, the average force applies on the ball by tha bat is 12209 in the direction opposite to the balls initial direction.
