1.If the half-life of a chemical compound is 30 days under anerobic conditions, determine the first-order removal-rate constant, k
2.A simply supported beam with a pin support at A and a roller support at B with length L=20 ft has a force P=10 kips applied at x=15 ft from point A. What are the reactions at A?
3.Determine the number of additional deaths per year occurring in apopulation of 300 million people from motor-vehicle accidents.Assume the annual risk of dying in a motor vehicle is 2.4 x10-4. Calculate the number of deaths over an averagelifetime of 70 years
4.Suppose drinking water contains 5 mg/L of phenol, 0.5 mg/L of xylene, and 0.35 mg/L acetone. If a 70-kg adult drinks 2 liters per day of this water for 20 years, calculate the hazard index and discuss whether this is a safe level of exposure.