A500n person stands in an elevator that is moving downward at constant speed. the force that the floor exerts on the person must be a) 500n upward b) 500n downward c) less than 500n upwards d) less than 500n downward

Which of the choices below is one of the primary gases found in the atmosphere? a. helium b. carbon dioxide c. nitrogen d. argon

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.