Physics, 03.02.2020 06:46 wronganswer1026

Frieda makes a pyramid of oranges for a display at the grocery store. a few minutes later, corwin bumps into the display and the oranges spill down. which change of state does the motion of the oranges most closely model? melting freezing condensation sublimation

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Im guessing it is a melting because it is going down as if the pyramid had helped. It is the only one that made sense to me. Hope this helps someone.

Answer from: gigipalacio32

Option (a) is the correct answer.

Explanation:

When a pyramid of oranges is made then it represents a solid state, that is, particles are closer to each other in the same manner as they are closer in a solid state.

When oranges spill then it represents the liquid state, that is, particles moves slightly apart from each other.

Hence, we can conclude that melting is the change of state depicted by the motion of the oranges most closely model.

Answer from: Quest

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

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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Frieda makes a pyramid of oranges for a display at the grocery store. a few minutes later, corwin bu...