I. The recommended daily allowance (RDA) of the trace metal magnesium is 410 / for males. Express this quantity in /.
II. For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams
per day should a 75-kg adult receive?
III. A typical multivitamin tablet can contain 2.0 mg of vitamin B2 (riboflavin), and the RDA is
0.0030 /. How many such tablets should a person take each day to get the proper
amount of this vitamin, assuming that he gets none from any other sources?
IV. The RDA for the trace element selenium is 0.000070 /. Express this dose in mg/day.

c. newton's third law of motion

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day