Work - Energy Problem confusing
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I find this confusing :s
Ref: Engineering Mechanics: vol 2 dynamics J L Meriam and L G Kraige, 3rd Edition, WileyOkay, W-E Use the formula:
No friction and N is always perpendicular to motion, so there is no work done.
We should be able to find Velocity by substituting into the equation and making W(1-2) = 0
I don't understand how we are supposed to find part B, assuming part A is correct?
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wah this is a very nice and interesting question!!!!
to find part b, I think we need to take into account a bit of circular motion... just a hunch only...
means...
mv^2/r (using your v from part i) = normal force + kx (force due to spring) - weigh of slider
try and see if u get the answer ;)
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ohh i just got pwned, how do u take into account circular motion.. it cant be right :S shouldnt work energy cover it already?
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repeat post*
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shouldnt work energy cover it already?
You already mentioned this mah:
N is always perpendicular to motion, so there is no work done.
;)
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yeah! so W(1-2) = 0
:S
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ok game over hahaha ill take another look tomorrow
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OK i managed to do part a)
v = 5.92 m/s
Essentially we use the W-E equation,
W(1-2) = Delta T + delta Vg + delta Ve
so i get
0 = 0.5(0.6)V^2 + 0.6(9.81)(-0.5) + (60)(0.05^2 - 0.35901^2)
which solves for our V.
However... im absolutely screwed over for part b...
help any1 :S?
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wait for b , ... n-t coordinate system.. ?
or must u use work -energy