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12 Nov 2019
Six concrete posts are used to support a waterfront pier. Each post has dimensions 14 in x 14 in x 15 ft. The average density of the concrete is 2.4 g/cm 12. Calculate the total surface area (in m2) ofone post. L a. b. Calculate the volume of concrete (in m') needed to make one post. c. Calculate the total mass in metric tons (t) of all six concrete posts. 13. Earth's surface area is 5.1 x 10* km', its crust has an average thickness of 35 km and an average density of 2.8 g/em'. The two rarest (non-radioactive) elements in the crust are ruthenium and rhodium, each with an abundance of 1.0x 10 g/metric ton crust. What is the total mass of these two elements in the earth's crust?
Six concrete posts are used to support a waterfront pier. Each post has dimensions 14 in x 14 in x 15 ft. The average density of the concrete is 2.4 g/cm 12. Calculate the total surface area (in m2) ofone post. L a. b. Calculate the volume of concrete (in m') needed to make one post. c. Calculate the total mass in metric tons (t) of all six concrete posts. 13. Earth's surface area is 5.1 x 10* km', its crust has an average thickness of 35 km and an average density of 2.8 g/em'. The two rarest (non-radioactive) elements in the crust are ruthenium and rhodium, each with an abundance of 1.0x 10 g/metric ton crust. What is the total mass of these two elements in the earth's crust?
Lelia LubowitzLv2
20 Sep 2019