How long does it take earth to spin on it axis once?

Using the given data table, calculate the acceleration of the skateboarder. you can use either form of the equation below?

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?