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/sci/ - Science & Math

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3805042 No.3805042 [Reply] [Original]

Could you guys help me with this Physics question? I really don't get what to do.

I can get the part where the missile is accelerating, but idk where to go from there.

two airplanes are flying toward each other

the plane on the left (good) has a speed of 150 m/s

the bad plane has a speed of 140 m/s

the good guy has a missile that can accelerate at 20 m/s2 up to its max speed of 500 m/s.

the good guy fires his missile at the bad guy when their planes are 15 km apart.

where does the missile strike the bad guy's airplane?

could you show me the steps of how to solve it?

>> No.3805106

For the first part i did:

a = (vf-vi) / t
t = (vf-vi0 / a
t = (500-150) / (20)
t = 17.5 sec

then i used that time for displacement

x = ((vf+vi) / 2) t
x = ((500+150) / 2) (17.5)
x = 5687.5 meters

I don't know how to get the next part. (where the missile hits the bad plane)

>> No.3805138

this is a troll

if its an actual physics question your teacher is a troll...

assuming they were flying head on, you would need to know how the pilot reacted, if he tried to turn, or climb it would be in the belly, otherwise it would hit the top of the plane, where from there depends on what type of plan and the pilots reaction timing...

>> No.3805152

>>3805138

Its not where on the plane, its where in the sky. like at what distance the missile hits the plane. I guess it could also be at what time the missile and plane hit each other.

>> No.3805156

the missile will hit the plane at 10.76 km relative to the good plane's starting position.

>> No.3805164

>>3805156

The answer is supposed to be 11.05 km

I need to know how to get that. Thanks for trying though.

>> No.3805168

>>3805164

Damn it. I hate physics. Let me see what I did wrong.

>> No.3805175

tip: the distance the system covers is 15km (missile will cover most of the distance itself). distance_missle + distance_plane = 15km.

>> No.3805180

>>3805168

Oh damn, I misread your question. I thought the missile traveled 300 m/s. Oops.

>> No.3805183

tip: draw a fucking picture

Always.

>> No.3805203

Sage for shitty highschool homework thread.

>> No.3805206

>>3805183
I did draw one, and I always do.

>>3805175
doesn't that leave me with 2 unknowns?

I have it so that the missile started at
position = 0m
and the bad plane starts at
position = 15000m

then the distance that the missile travels when it's still accelerating is 5687.5m, and it does that in 17.5s

this is frustrating

>> No.3805222

>>3805183

Heh.

>> No.3805227
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3805227

pic delivered

>> No.3805235

>>3805206

Well, distance traveled will be 15km total. Enemy plane has constant velocity. Missile has varying velocity.

Maybe to get you thinking about how it works simplify the problem: there is no enemy plane; it's a building in the sky instead. Now what do you get for the time of impact.

From there try adding the enemy plane variable.

>> No.3805256
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3805256

>>3805227

Better.

>> No.3805290

I got
t = 23.769... seconds
and the left aeroplane is 3461.538... metres from it's initial position. Fuck rounding and significant figures, bitchez.

>> No.3805316

If you're still there, I'm going to write out a solution for you, op. Bump this thread if you're still here. I don't want to waste my time for nothing.

>> No.3805323
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3805323

>>3805227
>>3805256

You forgot that one plane was a bad plane

>> No.3805324

>>3805316

I'm here.
Thank you for helping.

>> No.3805333

/didn't read through the thread

OP, you did account for the initial velocity of the missile, right?

150m/s, not zero.

>> No.3805335

>>3805333

yeah I got that, thanks.

>> No.3805350

bump

>> No.3805361

>>3805350
I'm still writing it up.

>> No.3805369

>>3805361

Okay, take your time.

and thanks again.

>> No.3805380

>>3805369
I just realised I got the velocities of the two planes mixed up but you should be able to figure out how to write the solution with the correct numbers plugged in once you see the solution. Scanning it now.

>> No.3805390

>>3805380

ok cool, thank you.

>> No.3805418
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3805418

what about flares?

>> No.3805419
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3805419

>>3805390
Here you go, faggot.

Oh by the way, it may interest you to know that I'm a freshman who failed his first semester of physics.

>> No.3805456
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3805456

>>3805419
>>3805419

Thanks for taking the time to write that up. <3

>> No.3805465
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3805465

>Oh by the way, it may interest you to know that I'm a freshman who failed his first semester of physics.

I'm guessing too much 4chan and not enough studying?

>> No.3805479

>>3805465
How did you know??

I was two marks away from passing. I probably would've gotten away with it if the workload didn't unexpectedly increase by over 9000% half way through the semester. It was a good wakeup call in any case.

>> No.3805560

Yo, faggot op. If you're still here, I just realised that the distance should be given by
<span class="math">
d = 15000-2900t-10t^2
[/spoiler]
instead of
<span class="math">
d = 15000-2900t-20t^2.
[/spoiler]

It's entirely your fault though for taking advice from 4chan.