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[quote][i]Originally posted by RichR[/i] [quote][i]Originally posted by Steve[/i] ORRR put it another way, there is a toy car on the treadmill with a piece of string attached to it you are standing off the treadmill holding the other end of the string. The car will be sat there with its wheels spinning on the spot yes? you pull the string the car moves forwards and the treadmill goes faster, and will go faster the faster the car goes are you telling me that you wouldnt be able to pull the car off the end of the treadmill in this scenario? [/quote] the treadmill your talking about would have a constant speed - so yes any extra energy exerted would cause the toy car to accelerate however for this question we are to assume that the conveyor is travelling at the exact same speed and opposite direction to the velocity of advance - and as the plane speeds up, so to does the conveyor so any extra energy exerted will cause the conveyor to speed up at the same rate you'd never overtake the conveyor! furthermore the mass of the plane is multiplied by the action of gravity (9.81 m/s) to give Newtonian units of weight - a 100T plane would weigh 981 kN a 15 g car would weigh 0.000147 kN the two have a copmpletely different reaction on the groundplane [/quote]
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