Question 1
If 1.4% of the mass of a human body is calcium, how many kilograms of calcium are there in a 195-pound man?
◦ 6.0 × 10
2 kg
◦ 1.2 × 10
2 kg Ca
◦ 6.0 kg Ca
◦ 1.2 kg Ca
Question 2
A fishing boat accidentally spills 6.0 barrels of diesel oil into the ocean. Each barrel contains 42 gallons. If the oil film on the ocean is 2.5 × 10
2 nm thick, how many square meters will the oil slick cover?
◦ 3.8 × 10
6 m
2◦ 3.8 × 10
7 m
2◦ 3.8 × 10
-3 m
2◦ none of these