You must write a lock that guards access to a shared bathroom. The bathroom may be used by several people at the same time, as long as they are of the same gender; however, mixing genders is never allowed. The data structure representing the lock has been filled in for you, please complete the code. Note: your code must allow for multiple people to use the bathroom, as long as they are of the same gender

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

What is a monomer? how do they form a ploymer from the view point of chemical bonding?

When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?