If a billion children neaten their bedrooms, how much does the entropy of their toys and clothing decrease? Assume that they each have one hundred distinguishable items weighing 20gm, initially randomly placed in a bedroom with V=5m3 , and that they end up located in their place in a drawer with center-of-mass location accuracy of 1cm. For this exercise, assume that the internal entropies of the objects are unchanged in the process (atomic vibrations, folding entropy for socks, etc.) Compare this entropy change to that of contracting the air in a one liter balloon by 1% in volume.

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

it was given as a lesson and guide for prayer.

prndulum needs thread, weight clock to time swings

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.