What is the density of cement that has a mass of 27.8g and a volume of 2.50 cm^3

On a cold day, when the air temperature is 0°c, you empty your lungs and take a deep breath, filling your lungs with 4.2 l of air. if you hold your breath until the temperature of the air in your lungs reaches 37°c, what is the volume of the air in your lungs at that point, assuming the pressure does not change?

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

When an object is heated it contracts. a. true b. false