Our subjective feeling of hot and cold depends on the rate at which heat is lost through our skin. in this problem, we will model the skin as a flat layer of fatty tissue (k 0.3 w/m °k) with a thickness of 4 mm, separating an environment with a constant temperature of 37°c (normal body temperature) and the outside air. on a calm winter day with an ambient temperature of 0'°c, the convective heat transfer coefficient between the skin and the ambient air is approximately equal to 20 w/m2 °k. find the heat flux lost through the skin.

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

Which element is the least metallic between cadmium, silver, zinc, or iron?