Use the table to the right to answer the following question. Item Energy released by burning 1 kg of a certain combustible sedimentary rock Energy (joules) How many kilograms of combustible sedimentary rock would be required to supply the energy needs of country A for 1 year? 1.6x 10° Energy released by fission of 1 kg of a certain isotope Energy released by fusion of hydrogen in 1 liter of water Country A annual energy consumption Country B annual energy consumption 5.6x 10 7x 10 1x 102 4x 10 It would take approximately (Use scientific notipn. Use the multiplication symbol in the math palette as needed. Round to three decimal places as needed.) kilograms.

11:21 Today Edit 9:02 AM Use the table to the right to answer the following question. Energy Joules) Compare the energy released by fission of 1 kilogram of element B to that released by buming 1 kilogram of element A. tem Energy released by burning kilogram of element A Energy released by fission of hydrogen in 1 kilogram of element B 5.5x 10 1.1x 1010 Fission of 1 kg of element B releases times as much energy as burning 1 kilogram (Round to the nearest whole number as needed.) element A.

Exercise 2.1.6 A body is found at a certain time and has a temperature of 92.6 degrees Fahren- heit in an environment with ambient temperature 70 degrees. Two hours later the body has a temperature of 90 degrees Fahrenheit. The flu was going around and it was believed the victim was on her way to the drugstore because her roommate said she had a temperature of 102.4 degrees Fahrenheit. If Newton's law of cooling holds, estimate when the person died, relative to the time the body was found. Hint: call the time the body is found t = 0 and solve u' (t) = -k(u(t) -A) with A = 70 and initial condition u(0) = 92.6. Then use u(2) = 90 to find k, and from that figure out at what time u(t) equaled 102.4.

* Sugar dissolves in water at a rate proportional to the amount still undissolved. If there were 70 kg of sugar present initially, and at the end of 4 hours only 30 kg is left, how many more hours will it take until 80 percent of the sugar is dissolved? 2.6 hours O 7.6 hours 5.9 hours O 3.6 hours

18 The half-life of a radioactive element can be modelled by M M where M, is the initial mass of the element, t is the elapsed time in hours, and M is the mass that remains after time t. The half-life of the element is

Silver 108 is a radioactive isotope that decays at a rate proportional to the amount present and has a half- life of 418 years. If the original amount present of silver 108 were 100 grams, how much would be left after 100 years? O A 78.45 grams OB. 80.77 grams OC. 84.72 grams D. 88.21 grams OE. 92.68 grams 2 of 25 Answered

Vital Statistics for US in one year: k=10,000 Population: 285,318,000 Deaths: 2,416,000 Live Births: 4,026,000 Deaths of infants under 1 year of age: 27,500 Deaths of infants under 28 days of age: 18,000 Deaths from HIV Infection: 43,900 Women aged 15-44: 61,811,000 Fetuses delivered w/o life after 20 weeks of gestation: 39,900 HIV infected persons: 900,000 Deaths from HIV: 17,402 Given the vital statistics above, find the HIV incidence rate.

QUESTION 2 COURSE CREDIT GRADE POINTS HOURS EARNED BIO-168 10 ENG-114 В 9. BAD-101 4 F МAТ-110 3 A 12 PED-129 1 A 4 Calculate the GPA by dividing the total grade points by the total credit hours. Round to two decimal places. The semester GPA is