Un gas ocupa un volumen de 200ml a una temperatura de 40°c¿que volumen ocupara si se disminuye la temperatura en 30°c y se mantiene una presion constante

An object thrown vertically upward from the surface of a celestial body at a velocity of 36 m/s reaches a height of sequalsminus0.9tsquaredplus36t meters in t seconds. a. determine the velocity v of the object after t seconds. b. when does the object reach its highest point? c. what is the height of the object at the highest point? d. when does the object strike the ground? e. with what velocity does the object strike the ground? f. on what intervals is the speed increasing?

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

Give one example to show that when substances are mixed, it may result in a chemical or a physical change depending on the conditions.