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A weight W is attached to a rope 15m long which passes over a pully 8m above the ground.The other end of the rope is attached to a truck at a point 2m above the ground. If the truck moves off at a speed of 2.5 m/s, find how fast the weight is rising when it is 3m above the ground. (Hint: At time...

Hi, I'm having trouble with the idea how one part of ethanol can be polar whilst the other is non polar. In my mid course, I got a queston that said explain this with diagrams and I had no idea but my teacher gave me a diagram showing how the oxygen is delta minus, hydrogen is delta plus and the...