A toxic radioactive substance with a density of 9 milligrams per square cm is detected in the ventilating ducts of a nuclear processing plant that was used 55 years ago. If the half life is 20 years, what was the density of the substance when it was depoited 55 years ago?

Q: The surface area of kelp near Monterrey Bay is 40,000 square acres, but after four years a red sea…

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Q: The half-life of Carbon-13 is 5750 years. Samples taken at an excavation site show that a one…

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Q: 4) Use the situation to answer the question. Iodine-131 has a half-life of 8 days. How much of the…

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Q: The half-life of Palladium-100 is 4 days. After 24 days a sample of Palladium-100 has been reduced…

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Q: A bacteria decreases at a rate of 15% continuously when exposed to ultraviolent light. If a culture…

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Q: A safety inspector determines that contamination from an abandoned factory site is spreading through…

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Q: A tank contains 1000 liters (L) of a solution consisting of 144 kg of salt dissolved in water. Pure…

A: A tank contains  liters of solution consisting of  of salt dissolved in water.Pure water is pumped…

Q: If 150 g of copper at initial temperature of 50 °C gains 6930 J of heat when it is cooled to 170°C.…

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Q: If the tank is completely full, how much is overflowing if 530 GPM is being taken off the bott

A: Given: Let the rate of filling be Qin = 1250 GPM  the rate of draining be Qdrain = 530 GPM Because…

Q: If a IV fluid bag is Flowing out of a 1.0 liter bag at the rate of 0.4 cc/min how long will it take…

A: Total volume of fluid flowing out =1.0 litre rate of flowing =0.4 cc/min

Q: A toxic radioactive substance in the amount of 7 miligrams per square centimeters is detected in the…

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Q: If human toenail grows at an average rate of about 0.13 inch a month.   1 year has 12 months. 1…

A: Given, Growth of human to nail =0.13 inch/month 1 year has 12 months. 1 inch is equal to 2.54 cm.…

Q: If you leave a 100-W light bulb on for a week, how many joules of energy will be consumed?

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Q: A tubular metal 3.9 meters long leans against a vertical wall and the other foot of the metal is on…

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Q: Lise Meitner bombarded 300 uranium atoms with a stream of neutrons for 10 seconds each.  She…

A: From the given information, Lise Meitner bombarded 300 uranium atoms and recorded the energy…

Q: A process tank is being filled at a rate of 1200 GPM. If the tank is completely full, how much is…

A: In flow rate is 1200 GPM. Out flow rate is 320 GPM.

Q: If the total depreciation after 1 year and 2 years in an equipment are 21,776 and 36,153…

A: We have to find salvage value

Q: The half-life of plutonium 239 is 24,200 years. Assume that the decay rate is proportional to the…

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.