YumYum247
  • YumYum247
Someone help me please!!!!!! :")
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
YumYum247
  • YumYum247
I need help with question 25, a,b,c
YumYum247
  • YumYum247
What does it mean by "coupling"?!?!??!?!?
YumYum247
  • YumYum247
@peachpi

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YumYum247
  • 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
  • YumYum247
@dan815
YumYum247
  • YumYum247
YumYum247
  • YumYum247
pooja195
  • pooja195
@nincompoop @TheSmartOne
pooja195
  • pooja195
@Zale101
YumYum247
  • YumYum247
@welshfella Please help me!!!! :")
YumYum247
  • YumYum247
@peachpi Can you please help me?!!?!!!
YumYum247
  • YumYum247
Thank you peachpi, my throat is all dried up from writing out loud to people for help...:"(
YumYum247
  • YumYum247
and Welsshfella!! :")
welshfella
  • welshfella
my physics is pretty rusty i'm afraid..
anonymous
  • 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
  • YumYum247
that's what i did....but i'm not too sure either.....and Welfella....Thank you for even attempting to help me. :")
welshfella
  • welshfella
you use Newton's second law of course F = ma and the third law? which deals with equal and opposite reactions
YumYum247
  • 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
  • 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
  • welshfella
|dw:1442519725559:dw|
YumYum247
  • 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
  • welshfella
the above is a simple case with one engine and one car
YumYum247
  • YumYum247
yes @welshfella did you see the resolution of the questions i uploaded?!?!?!?!?
welshfella
  • welshfella
the tension in the coupling can be found by Newtons 2nd law T = m * a = 6400 * 0.2 = 1280 N
welshfella
  • welshfella
No i'll take a look
YumYum247
  • YumYum247
true but have you seen how i attempted to do the next question.....
YumYum247
  • YumYum247
alright....
welshfella
  • welshfella
I'm afraid I cant see it very well with my old eyes!!! lol
YumYum247
  • YumYum247
Aaawwnnn, try to zoom in...:)
welshfella
  • welshfella
you are on the right track, I believe
YumYum247
  • YumYum247
Ok can you please help me find how far along the track the train must have travelled in 2 minutes after starting??????/
YumYum247
  • 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
  • anonymous
You can use the kinematic formula since acceleration is constant \[d=v_0t+\frac{ 1 }{ 2 }at^2\]
YumYum247
  • YumYum247
but what is the initial velocity of the train tho :"(
anonymous
  • anonymous
0, the train is initially at rest
YumYum247
  • YumYum247
oh....the train is motionless....so Vi = om/sec.
YumYum247
  • YumYum247
ok just last question.....did i do questu=ion "B" right????
YumYum247
  • YumYum247
just take a look at the work i've uploaded....
anonymous
  • anonymous
it looks right
YumYum247
  • YumYum247
YumYum247
  • YumYum247
Ok thank you and i LOVE you!!!! :")
anonymous
  • anonymous
lol let me know how this turns out.
YumYum247
  • YumYum247
|dw:1442524560809:dw|

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