Physics

Someone please explain how to do this???

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google.com/search?q=speed of sound * 2.5ms
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You take the smooth manifold [math]\left( U,\, \tau,\, \mathscr A\right)[/math] of the universe and find a chart that contains both the car and the wall for all [math]t\,\in\,\mathbf R[/math]. Then you map everything to a 4-dimensionnal vector space over [math]\mathbf R[/math] by means of the homeomorphism of your chart. All that's left to do is solve the wave equation for all possible positions of the car and see which solution fits what the wording tells you. :-)

literally speed=distance/time senpai

This is impossible to answer unless you know how far ultrasound travels in 5ms

What does the paper say the speed of sound is

Light travels 1ft/ns so there is 2,500,000 feet between the car and the wall or 470 miles.

>Light travels 1ft/ns
MFW American physics

google.com/search?q=speed of sound * 2.5ms

The answer is 0.85 meters. The proof is trivial and left as an exercise to the reader

It actually does just about. What a weird coincidence

Unstoppable force meets immovable object and objective boundary at su jective speed and angle

>Unstoppable force meets immovable object
Contradiction in terms, by definition only one can exist at any given time

>speed of sound is a constant
kys my man

Constant enough for high school math

nice post

but goddamn are people this dumb?

maybe do a welding certificate instead or something

Assume a standard density of air molecules and then integrate over the volume between the barrier and the car. Once you have that N, you can string together all the possible paths by which they can link and evolve with time while minimizing potential energy and conserving momentum.

The answer is 6.022e23 m. This answer is reasonable because it's Avogadro's number, which is true for a gas like air.

It depends on the how the density of the wall affects space-time. If they don't give it to you then you have to leave it in terms of ρ

I calculated 0.8575 metres and after sigfigs I get 0.9 metres.

Sounds like you've got the wrong board bud; leather club is two blocks down.

Jokes aside, can we assume the speed of sound is 3E8 m/s?

>by definition
There is no definition that allows a force to be "stoppable".

WRONG
An immovable object IS an unstoppable force. All that is required is to change your reference frame.

The answer to an unstoppable force meeting an immovable object is that the force carrier/object does not interact with any particle, through any mechanism, they merely pass through/by each other without interacting

STAY MAD BRAINLET :^))^)^)^)^)

I got 0.85075 twice. One of us is making a mistake

What is the stiffness coefficient and density of the elastic medium in which the signals are propagating through?

1492 km

Calculate the speed of sound of the medium the car is in based on temperature, pressure, humidity, speed of sound, medium velocity and phase of the moon.

But this alone is not enough to calculate how far the wall is. Because ultrasonic waves can take multiple paths back to the receiver, timing alone is not enough to figure out distance to an obstacle.

An example of this is the case of a concave wall. With a concave wall the sound can bounce off the wall back to another part of the car, and then back to the wall and the receiver. If we measure distance based on sound travel time, our sensor will report that the wall is much farther away than it actually is. Therefore this question is impossible to answer, and is a trick question.

Ultrasonic distance sensors are shit. The case above of the curved wall is why we don't use them on robots anymore.

>E.M.R travels at ~3x10^8 m/s
>convert ms to s
Are you serious OP?

this