The top layer of your goose down sleeping bag has a thickness of 5.1 cm and a surface area of 1.0 m^2 . when the outside temperature is -19 c you lose 26 cal/hr by heat conduction through the bag (which remains at a cozy 35 c inside). assume that you're sleeping on an insulated pad that eliminates heat conduction to the ground beneath you. what is the thermal conductivity of the goose down?

there are no atoms

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.