Qualification > Math
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[Spy]:
Doubts/Predictions/Past Paper Questions
hello people, im amazing at mechanics, i solved alll papers and i got a 48/50 in my mock in mehcanics
so any help im here :)
mz:
awesome! please post any predictions! or pm me!!! i was good at m1 but right now i cannot comprehend any question...can you please give an overview of what we have to keep in mind when solving enery/work related questions???
Ghost Of Highbury:
One horse pulls with a force of X N, a cart of mass 800 kg along a horizontal road at constant speed. Three horses, each pulling with a force of X N, give the cart an acceleration of 0.8m/s^2. Find the time it wd take for 2 horses to increase the speed of the cart from 2m/s to 5m/s, given that each horse pulls with a force of X N and that the resistance to motion has the same constant values.
[Spy]:
--- Quote from: A@di on May 15, 2010, 03:19:22 pm ---One horse pulls with a force of X N, a cart of mass 800 kg along a horizontal road at constant speed. Three horses, each pulling with a force of X N, give the cart an acceleration of 0.8m/s^2. Find the time it wd take for 2 horses to increase the speed of the cart from 2m/s to 5m/s, given that each horse pulls with a force of X N and that the resistance to motion has the same constant values.
--- End quote ---
is the answer 7.01 seconds?
cooldude:
--- Quote from: A@di on May 15, 2010, 03:19:22 pm ---One horse pulls with a force of X N, a cart of mass 800 kg along a horizontal road at constant speed. Three horses, each pulling with a force of X N, give the cart an acceleration of 0.8m/s^2. Find the time it wd take for 2 horses to increase the speed of the cart from 2m/s to 5m/s, given that each horse pulls with a force of X N and that the resistance to motion has the same constant values.
--- End quote ---
let the resistance to the cart=R
therefore X-R=0, X=R
3X-R=ma, 3X-R=800*0.8
2R=640
R=X=320
2X-R=800a
320=800a
a=0.4
v=u+at
5=2+0.4t
t=7.5 sec
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