health study concluded that following 7 simple health rules can extend a human’s life by 7-11 years on the average. These 7 rules are as follows: no smoking, get regular exercise, use alcohol only in moderation, get 7 to 8 hours of sleep, maintain proper weight, eat breakfast, and do not eat between meals. In how many ways can a person adopt 5 of these rules, a. If the person presently violates all 7 rules? b. If the person never drinks and always eats breakfast?

Q: A manufacturer claims that its rechargeable batteries can be charge 500 or more times. A random…

A: μ (mean) = 505 σ (standard deviation) = 10 For 1 %( = 0.01) LOS Z = -2.327

Q: 1. Out of 300 workers in a plant manufacturing Gen-X, 23 developed liver cancer. A control group…

A: Step 1: Step 2: Step 3: Step 4:

Q: A water system is subjected to disinfection. Total applied chlorine is 12 mg/1. At break point,…

A:

Q: Assume a population of fish grows exponentially. A pond is stocked initially with 500 fish. After 6…

A: Given: Fish at beginning= 500, Fish at 6 months= 1000,

Q: A woman weighing 78 kg drinks 2 liters per day of water that contains 5 mg/L of Contaminant X. If…

A: Given: The weight of the woman is 78 kg. The ingestion rate is 2 L/day. The concentration of…

Q: Initially, a 2400-kg car is moving with the velocity of 72 km/h. After 5 seconds the car has slowed…

A: Mass of car, m = 2400 kg 1kmhr= 518 msec Initial velocity, u = 72 kmhr = 20 msec Final…

Q: One eight-ounce glass of apple juice and one eight-ounce glass of orange juice contain a total of…

A: Given:- One eight ounce glass of apple juice and one eight ounce of orange juice contanis a total of…

Q: How much energy we can save ? Energy needed to treat water Average energy use for water treatment…

A: Solution: The dishwasher and cloth washers are not taken. Recalculating the problem by considering…

Q: QUESTION 1 COP21 is aiming to achieve a legally binding and universal agreement to to keep global…

A: At COP 21 in Paris, on 12 December 2015, Parties to the UNFCCC reached a landmark agreement to…

Q: Joey says he is itchy. There is a test for allergy to cats, but this test is not alwaysr ight. For…

A: For people that really do have an allergy, the test says yes 85% of the time.

Q: Calculate by arithmetic progression the probable population in the year 2020, 2025, 2030 and 2033.…

A: Given: The populations are, Year Population 1940 8000 1950 9200 1955 10500…

Q: When drinking water is disinfected with chlorine an undesired byproduct, chloroform, is formed.…

A: Given data70-kg person drinks 2 L of water every day for 70 years chloroform concentration =0.1 mg/L…

Q: A balloon is being filled with water at an instant when the diameter is 50 cm. If the flow rate into…

A:

Q: Calculate in units of (mg/L)*min the C'T product of water disinfection with chlorine tablets. Use…

A: Given data-  Number of chlorine tablets = 2 Concentration of chlorine in each tablet= 15 mg. Water…

Q: A family consists of an adult male weighing 70 kg, an adult female weighing 50 kg, and a child…

A: Given: The weight of the male is 70 kg. The weight of the female is 50 kg. The weight of the child…

Q: A person smokes one cigarette in 60 seconds in a waiting room. The concentration of smoke particles…

A: We know that inhalation rate smoke particles in mg/s is given by mass of smoke particles inhales per…

Q: Q1: Consider a 3 bedroom, 1,063 square meter single family home to which you would like to add…

A: No of bed room Nbr= 3 Area of the floor Afloor= 1063 sq m Whole building continuous ventilation rate…

Q: 2. In an experiment to study the relationship of hypertension and smoking habits, the following data…

A: Having high blood pressure, or hypertension means having a higher than normal blood pressure. As you…

Q: Chlorine is used as the disinfectant in a municipal water treatment plant. It achieves 50 percent of…

A: A municipal water treatment plant case-

Q: Information about the level of CO present in the air is usually expressed in ppm, parts per million.…

A: Given data: Maximum limit recommended by the World Health Organization (WHO) = 9 ppm The information…

Q: Calculate the risk for a compound with toxicity dose of 10 ug/L, unit risk (RU) of 3.2 x 10-5 L/mg…

A: The formula to calculate the Risk is given by, Risk=Unit Risk×Toxicity dose×Exposure timeTotal time

Q: A paint shop buys 52,000 liters of car paint based on VOC. In one year, they applied 50,800 liters…

A: Given data52000  liters of car paint Applied 50800 liters of same same point into the products…

Q: 3. Find the concentration of polychlorinated biphenyls in drinking water that would result in a 10-6…

A: The concentration of polychlorinated biphenyls (PCBs) in drinking water that would result in a risk…

Q: West Texas Intermediate Crude Specific Gravity: 0.8212 1. Calculate API gravity of West Texas crude…

A:

Q: In a lab experiment of a Jar test, the following observations are found. Find the optimum dose of a…

A:

Q: A family eats homegrown vegetables daily which is irrigated with water from a river polluted with…

A:

Q: Determine the individual Hazard Quotients and the overall Hazard Index associated with a 70 kg adult…

A: Given data: Weight of adult is 70 kg. Weigh of fish consumed by adult per day is 15 g. Fish contains…

Q: Chlorine is used as the disinfectant in a municipal water treatment plant. It achieves 50 percent of…

A: given data:

Q: Next time you are putting gasoline in your car, determine the volumetric flow rate of the gasoline…

A: To find:- t

Q: A student is concerned with the amount of air pollution students are exposed to in the school’s…

A: The objective of the given scenario is to enhance the reliability of an investigation assessing…

Q: hese chemicals would you use to calculate hardness? (b) All aqueous solutions must ge neutrality.…

A: hardness of water =?

Q: If the ambient temperature is 30° and the substance cools from 100° to 70° in 15 minutes, how long…

A: Using newtons theorem…

Q: If 12 ppm of alum dose is required for the treatment of water, find the quantity of alum for the…

A: given- 12 ppm alum dosevolume of water to be treated-V=10 million liters

Q: 2. Isa foods wishes to see whether there is any preference in the flavors of corn chips that are…

A: Isa foods wish to see whether there is any preference in the flavours of crop chip that are sold at…

Q: 5.41 A nationwide survey of 17,000 college seniors by the University of Michigan revealed that…

A: Given  Total no. Of seniors= 17,000

Q: The Hazard Index criterion is often used for potential health risk associated with a chemical…

A: The objective of the question is to calculate the Hazard Index (HI) for an oral exposure in the…

Q: Q6: Consider a 3 bedroom apartment with 3 roommates. The apartment has a volume of 11,742 m^3 with 3…

A: Solution: Given: Number of Bedroom = 3 Roommates = 3 Volume of apartment = 11742 m3 Ceiling Height =…

Q: A step-dose tracer test was conducted on the clear well of a water treatment plant. A constant…

A: Given, The constant fluoride dosage C0 = 2.0 mg/l C20=0.10 mg/l

Q: Example 7: Each month, an American household generates an average of 28 pounds of newspaper for…

A:

Q: I. A man takes 40 mg of a certain medicine. Each hour, the amount of medicine in the man's system…

A:

Landfills

The landfill is a site used for the disposal of waste materials. The landfill is a solid waste facility that is often known as a dumping ground. The image below shows a landfill site in Hawaii. Landfilling is the most ancient and common method used for the disposal of waste. For the landfill, a deep trench is constructed in an isolated place away from the city. The trench for landfills is designed properly after analyzing the total population and the waste generation per capita. The waste is dumped into the trench and after every layer of waste, a layer of soil is spread on the top of it.