1) Dado os conjuntos A = {1, 4, 6, 9} e B = {1,6,7, 10}, a união de A com B (A ∪ B) é: a) A ∪ B = {1, 4, 6, 7, 9, 10}
b) A ∪ B = {1, 6, 9}
c) A ∪ B = {1, 6}
d) A ∪ B = {6, 9}
e) A ∪ B = {1}

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?