Consider two cylinders that start down identical inclines from rest except that one is frictionless. thus one cylinder rolls without slipping, while the other slides frictionlessly without rolling. they both travel a short distance at the bottom and then start up another incline. explain why the time for the rolling motion is greater than that for the sliding motion, and yet they both reach the same ending height which also is equal to their starting height.

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.