The ozone in the upper atmosphere is on average only about 3mm thick if brought down to sea level. given that the density of ozone at sea level is 2.0 grams/litre, what is the total amount of ozone (in tonnes) in the upper atmosphere when it's sea level thickness is 3.2mm? take the radius of the earth to be 6400 km. (the volume of a thin skin around an object is the surface area of the object times it's skin thickness).

Nthe opening scene of the movie raiders of the lost ark, indiana jones replaces a golden statue with a bag of sand. the platform on which the statue is placed is designed to detect the mass of the statue. if the bag of sand has a different mass than the statue, then a mechanism triggers and destruction ensues. the density of gold is about 20\text{ g/cm}^320 g/cm 3 20, space, g, slash, c, m, start superscript, 3, end superscript. the density of sand can be estimated at 2.5\text{ g/cm}^32.5 g/cm 3 2, point, 5, space, g, slash, c, m, start superscript, 3, end superscript. the gold statue can be modeled as a cylinder with height 25\text{ cm}25 cm25, space, c, m and radius 8\text{ cm}8 cm8, space, c, m. in terms of \piπpi, what is the mass of sand indiana jones needs to avoid triggering the mechanism?