Physics, 30.07.2019 03:00 priscillavaladez1112

Classify the sentences based on whether they describe temperature or thermal energy. it’s a measure of the average kinetic energy of particles in a sample. it’s a measure of the total kinetic energy of particles in a sample. it depends on the size of the sample. it doesn’t depend on the size of the sample. ©

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Hello!

A) It's a measure of the average kinetic energy of particles in a sample: Temperature.

B) It's a measure of the total kinetic energy of particles in a sample: Thermal Energy.

C) It depends on the size of the sample: Thermal Energy

D) It doesn't depend on the size of the sample: Temperature

Although similar, Temperature and Thermal Energy are not the same. The key difference between them is that Temperature is the average kinetic energy of the molecules, and Thermal Energy is a measure of the total kinetic energy of the molecules.

As Temperature is an average amount, it doesn't depend on the size of the sample, only on the kinetic energy distribution, but Thermal energy depends on the size of the sample because more molecules will mean an increase in the total energy.

Have a nice day!

Answer from: trietvo112200

A) It's a measure of the average kinetic energy of particles in a sample: Temperature.

B) It's a measure of the total kinetic energy of particles in a sample: Thermal Energy.

C) It depends on the size of the sample: Thermal Energy

D) It doesn't depend on the size of the sample: Temperature

Explanation:

Answer from: Quest

Kiloleter, mega leterhope this !

Answer from: Quest

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

$x(t)=ax(x-6)$

where $a$ is unknown. because the position is parabolic, there is symmetry about the midpoint at $t=3$ , and we know that

$x(3)=10\implies -9a=10\implies a=-\dfrac{10}9$

so that the position function is

$x(t)=-\dfrac{10}9x(x-6)$

which means the velocity is

$v(t)=\dfrac{\mathrm dx}{\mathrm dt}=-\dfrac{20}9x+\dfrac{60}9$

then the total distance traveled is

$\displaystyle\int_{t=0}^{t=6}|v(t)|\,\mathrm dt=\left\{\int_{t-0}^{t=3}-\int_{t=3}^{t=6}\right\}v(t)\,\mathrm dt=20$

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at $x=0$ and ends at $x=0$ , so its displacement is 0.

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