A rock weighs 20 N in air and 15 N when completely submerged in a fluid with a density of 800 kg/m3.   Determine the density of the rock.

Sphere 1 has an emissivity of 0.8, its radius is 1 m, and its temperature is 25 °C. Sphere 2 has an emissivity of 0.4, and a radius of 1 m. What should be the temperature of Sphere 2 so it emits radiation at the same power as Sphere 1?   

A rock weighs 20 N in air and 15 N when completely submerged in a fluid with a density of 800 kg/m3.   Determine the density of the rock.

A heat engine is used to lift a 4500-kg load to a height of 3 m at a constant speed. During the lifting process, the engine received 400,000 J of heat from the fuel burned in its interior. What is the efficiency of the engine?

Sphere 1 has an emissivity of 0.8, its radius is 1 m, and its temperature is 25 °C. Sphere 2 has an emissivity of 0.4, and a radius of 1 m. What should be the temperature of Sphere 2 so it emits radiation at the same power as Sphere 1?   

A heat engine is used to lift a 3000-kg load to a height of 4 m at a constant speed. During the lifting process, the engine received 500,000 J of heat from the fuel burned in its interior. What is the efficiency of the engine?

Using the fFigure, match the following:Lipid.

In a well-insulated container, 3.5 kg of water and 2.0 kg of ice are in thermal equilibrium at 0 °C. How much heat is required to bring the system to thermal equilibrium at 35 °C?

A heat engine is used to lift a 4500-kg load to a height of 3 m at a constant speed. During the lifting process, the engine received 400,000 J of heat from the fuel burned in its interior. What is the efficiency of the engine?

An ideal gas initially has a volume of 0.036 m3, an absolute pressure of 2 atm, and a temperature of 33 °C.  The pressure becomes 1 atm when the volume of the container is decreased to 0.012 m3.  What is the final temperature of the gas?