An accident at a nuclear power plant has left the surrounding area polluted with radioactive material that decays naturally. The initial amount of radioactive material present is 15 su (safe units), and 5 months later it is still 10 su.
(a) Write a formula giving the amount A (t ) of radioactive material (in su) remaining after t months.
(b) What amount of radioactive material will remain after 8 months?
(c) How long—total number of months or fraction thereof will it be until
Want to see the full answer?
Check out a sample textbook solutionChapter 1 Solutions
Differential Equations: Computing and Modeling (5th Edition), Edwards, Penney & Calvis
Additional Engineering Textbook Solutions
Concepts of Programming Languages (11th Edition)
Java: An Introduction to Problem Solving and Programming (7th Edition)
Java How to Program, Early Objects (11th Edition) (Deitel: How to Program)
Starting Out with Java: From Control Structures through Objects (6th Edition)
Starting Out With Visual Basic (7th Edition)
- 5. Determine the overall resistance of a 100-meter length of 14 AWA (0.163 cm diameter) wire made of the following materials. a. copper (resistivity = 1.67x10* Q•m) b. silver (resistivity = 1.59x10 Q•m) c. aluminum (resistivity = 2.65x10* Q•m) d. iron (resistivity = 9.71x10* Q•m)arrow_forward4- The potential difference 2 points between two point in an electric circuit is 24 V, If 0.4 J of energy were dissipated in a period of 5 ms, what would the current be between the two points? *arrow_forwardAn iron rod is graded based on the following criteria: Magnetite content must be greater than 50 Calcium carbonate must be less than 0.7 Other adulterants must be greater than 5600 The grades are as follows: Grade is A if all three conditions are met. Grade is B if conditions (i) and (ii) are met Grade is C if conditions (ii) and (iii) are met Grade is D if conditions (i) and (iii) are met Grade is E if conditions only one condition is met Grade is F if none of the conditions are met. Write a program in which you ask user to enter the values of Magnetite, Calcium Carbonate and other adulterants. The output will be generated as per the conditions mentioned above. (Put the visible screen shots of the output with 2 to 4 different input variations)arrow_forward
- (Oceanography) The pressure, P, exerted on an underwater object can be determined by this formula: P=gh is the density of water, which is 1.94slug/ft3 . g is the acceleration caused by Earth’s gravity, which is 32.2ft/sec2. h is the object’s depth in the water in feet. a. Determine the units of P by calculating the units resulting from the right side of the formula. Check that your answer corresponds to the units for pressure listed in Table 1.1. b. Determine the pressure on a submarine operating at a depth of 2500 feet.arrow_forwardTwo bicyclists, starting at the same place, are riding toward the same campground by different routes. One cyclist rides 1280 m due east and then turns due north and travels another 1430 m before reaching the campground. The second cyclist starts out by heading due north for 1930 m and then turns and heads directly toward the campground. (a) At the turning point, how far is the second cyclist from the campground? (b) In what direction (measured relative to due east within the range (-180', 180') must the second cyclist head during the last part of the trip? (a) Number Units (b) Number Unitsarrow_forwardNoted: I want to this answer in just simple C language program.THANK YOU An iron rod is graded based on the following criteria: (i) magnetite must be greater than 50 (ii) calcium carbonate content must be less than 0.7 (iii) other adulterants must be greater than 5600 The grades are as follows: Grade is A if all three conditions are met Grade is B if conditions (i) and (ii) are met Grade is C if conditions (ii) and (iii) are met Grade is D if conditions (i) and (iii) are met Grade is E if only one condition is met Grade is F if none of the conditions are met Write a program, which will require the user to give values of magnetite, calcium carbonate and other adulterants under consideration and output the grade of the iron.arrow_forward
- I A bob attached to a cord is moved to the right where its vertical position is 1.05 cm above the equilibrium position and is then given an initial speed of 0.6 m/s. What are the values of the maximum speed and maximum height reached by the bob? (Take g = 9.8 m/s') (a) hmax (b)hmax =D1.87 cm; tnax 3.44 m/s (c) hmax (d) hmax 2.89 cm; Vnax = 0.75 m/s 1.87 cm; max 0.75 m/s 2.89 cm; 1,ax 3.44 m/s or frequency to 2/:arrow_forwardA person places $5000 in an account that accrues interest compounded continuously. Assuming no additional deposits or withdrawals, how much will be in the account after seven years if the interest rate is a constant 8.5 percent for the first four years and a constant 9.25 percent for the last three years?arrow_forwardExample 7: Rocket sleds were used to test aircraft and its effects on human subjects at high speeds. It is consisted of four rockets; each rocket creates an identical thrust T. Calculate the magnitude of force exerted by each rocket (T) for the four-rocket propulsion system shown in the Figure. The sled's initial acceleration is 49 m/s, the mass of the system is 2100 kg, and the force of friction opposing the motion is known to be 650 N. Solution: H.W Free-body diagramarrow_forward
- A coal mine purchased 3 years ago for $7 million was estimated to contain 4,000,000 tons of coal. During the past 3 years the amount of coal removed was 21,000, 18,000, and 20,000 tons, respectively. The gross income obtained in these 3 years was $257,000 for the first year, $320,000 for the second year, and $340,000 for the third year. What is the cost depletion allowance for year 1.arrow_forwardA student driving a car travels 9 km in 0.4 Hour. What was her average speed? * 5.65 m/s 6.56 m/s 5.56 m/s 6.65 m/s 6.25 m/sarrow_forwardQ2: A) The annual load duration curve of a certain power station can be considered as a straight line from 20 MW to 4 MW. To meet this load, three turbine-generator units, two rated at 10 MW each and one rated at 5 MW are installed. Determine (i) installed capacity (ii) plant factor (iii) units generated per annum (iv) load factor and (v) utilization factor.arrow_forward
- C++ for Engineers and ScientistsComputer ScienceISBN:9781133187844Author:Bronson, Gary J.Publisher:Course Technology Ptr