Sound waves can be used to measure ocean depth. this done by sending a sound wave to the floor of the ocean and recording the time it takes to return to a machine. what did the inventory of this machine need to know while developing the machine

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20â°c throughout the year, while the walls of the room are nominally at 27â°c and 14â°c in the summer and winter, respectively. the exposed surface of a person in the room may be assumed to be at a temperature of 32â°c throughout the year and to have an emissivity of 0.90. the coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 w/m2 â‹…â‹… k. what is the ratio of the thermal resistance due to convection to the thermal resistance due to radiation in the summer? what is the ratio of thermal resistances in the winter