Someone help me please!!!!!! :")

- YumYum247

Someone help me please!!!!!! :")

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- katieb

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- YumYum247

I need help with question 25, a,b,c

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- YumYum247

What does it mean by "coupling"?!?!??!?!?

- YumYum247

@peachpi

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- YumYum247

do you want me to upload my work?????? i've tried to do the question but idk if it's even right tho :(

- YumYum247

@dan815

- YumYum247

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- YumYum247

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- pooja195

@nincompoop @TheSmartOne

- pooja195

@Zale101

- YumYum247

@welshfella Please help me!!!! :")

- YumYum247

@peachpi Can you please help me?!!?!!!

- YumYum247

Thank you peachpi, my throat is all dried up from writing out loud to people for help...:"(

- YumYum247

and Welsshfella!! :")

- welshfella

my physics is pretty rusty i'm afraid..

- anonymous

seriously, I have no confidence in this. It's a wild shot in the dark. I'm thinking for a) you need to account for the mass of all 15 cars and for b) only the last 8|dw:1442519089103:dw|

- YumYum247

that's what i did....but i'm not too sure either.....and Welfella....Thank you for even attempting to help me. :")

- welshfella

you use Newton's second law of course F = ma
and the third law? which deals with equal and opposite reactions

- YumYum247

So this is what i did, first i multiplied the total mass of the 15cars = 96000Kg by the acceleration to get the net force of the train pushing on the buggies. (19,200N)

- welshfella

the coupling is the connection between the engine and the first car and also between all the 15 cars. It will be a rigid bar which will be in tension.

- welshfella

|dw:1442519725559:dw|

- YumYum247

To find the force on the "coupling" between car number 8 and 9. first i counted how many cars number 8 is from 15 which is 8...i think...i multiplied the mass of all 8 cars by the acceleration and then counted the mass of all the cars from 9 to 15 and multiplied their mass by ht acceleration and subtracted the net force from 8 to 9 to get the net force between cars 8 and 9.

- welshfella

the above is a simple case with one engine and one car

- YumYum247

yes @welshfella did you see the resolution of the questions i uploaded?!?!?!?!?

- welshfella

the tension in the coupling
can be found by Newtons 2nd law
T = m * a = 6400 * 0.2 = 1280 N

- welshfella

No i'll take a look

- YumYum247

true but have you seen how i attempted to do the next question.....

- YumYum247

alright....

- welshfella

I'm afraid I cant see it very well with my old eyes!!! lol

- YumYum247

Aaawwnnn, try to zoom in...:)

- welshfella

you are on the right track, I believe

- YumYum247

Ok can you please help me find how far along the track the train must have travelled in 2 minutes after starting??????/

- YumYum247

the acceleration of the train is 0.20m/sec^2 and the total mass of the train is 96000Kg, and the net force on the buggies with all the load is 19,200N.

- anonymous

You can use the kinematic formula since acceleration is constant
\[d=v_0t+\frac{ 1 }{ 2 }at^2\]

- YumYum247

but what is the initial velocity of the train tho :"(

- anonymous

0, the train is initially at rest

- YumYum247

oh....the train is motionless....so Vi = om/sec.

- YumYum247

ok just last question.....did i do questu=ion "B" right????

- YumYum247

just take a look at the work i've uploaded....

- anonymous

it looks right

- YumYum247

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- YumYum247

Ok thank you and i LOVE you!!!! :")

- anonymous

lol let me know how this turns out.

- YumYum247

|dw:1442524560809:dw|

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