Physics, 24.01.2020 10:31 okokalyssa

Which of the following statements most accurately differentiates potential and kinetic (a)kinetic energy is a form of mechanic energy, while gravitational potential is not.(b.)any object that has motion has kinetic energy, while any object not in motion but with the potential to do work has potential energy.(c)gravitational potential energy is a form of mechanical energy, while kinetic energy is not.(d)any object that has motion has potential energy, while any object not in motion but with the potential to do work has kinetic energy

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Answer from: captaincluck52

(B), since that is an accurate definition of kinetic and potential energy
Hope this helped out :)

Answer from: chocodeer

The kinetic energy is related to the motion. Hence, any object which is in motion will have kinetic energy associated with the object and an object at rest will have zero kinetic energy.

Any object which has a potential to do work in the future has potential energy associated with it. For example: A compressed spring has potential energy stored in it and it gets converted into the work by keeping an object in front of it.

Hence, the option B is correct.

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.

Answer from: Quest

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

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Which of the following statements most accurately differentiates potential and kinetic (a)kinetic en...

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