Recent content by Chris

Aren't dextercioby and vincentchan answering different questions? :smile: Dextercioby gives the proof that the total power output for a given series circuit is the sum of the power outputs from all the components in that series circuit. Vincentchan addresses what I believe was the original...

Hi BlasterV, Are you sure that your answer of 22.83m/s for Alyson's velocity is correct? After the following calculation, I got a different answer: Impulse = Change in Momentum = Force * Time I = Ft I = 1200 * 0.75 = 900Ns This is Alyson's momentum after being pushed by Caroline...

Bumpety-bump

Well spotted chronon. Initially I hadn't considered solutions where the largest numbers aren't in the outermost circles, but that's clearly not the best approach. That answers the question about multiple solutions! Chris

This is a problem which was given to my six-year-old cousin: (you'll probably need a bit of paper) Imagine three circles A, B and C in a straight line. A overlaps B and B overlaps C such that there are 5 distinct regions. You have to place the numbers 1-5, using each number only once, into...

Thanks guys! :smile:

Thanks krab. So is this situation (paperclip in magnetic field) analagous to that of a mass in a gravitational field, in terms of energy transfers?

When a magnet is used to lift up a paperclip, clearly it gains gravitational potential energy. Where does this energy come from? Does the magnet lose energy to the paperclip? Does the magnet regain this energy when the paperclip is removed from the magnetic field? I have never heard of the...