27. A cup of coffee at 90°C is placed in a 20°C room. After 10 minutes, the coffee hascooled to 60°C. How long will it take for the coffee to cool to 30°C? 28. A tank contains 1000 L of pure water. Brine containing 0.1 kg of salt per liter entersthe tank at a rate of 10 L/min, and the well-mixed solution leaves at the same rate.How much salt is in the tank after 30 minutes?

27. A cup of coffee at 90°C is placed in a 20°C room. After 10 minutes, the coffee hascooled to 60°C. How long will it take for the coffee to cool to 30°C? 28. A tank contains 1000 L of pure water. Brine containing 0.1 kg of salt per liter entersthe tank at a rate of 10 L/min, and the well-mixed solution leaves at the same rate.How much salt is in the tank after 30 minutes?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter2: Linear Equations

Section2.7: Litereal Equations And Dimensional Analysis

Problem 24PPS

See similar textbooks

Similar questions

Estimate the age of a newly discovered fossil for which the ratio of carbon-14 to carbon-12 is R=1/1014.
The half-life of radioactive iodine is 60 days. How much of a 50-mg sample will be left in 40 days?
The half-life of radioactive iodine is 60 days. How much of a 50 mg sample will be left in 40 days?
The half-life of magnesium-27 is 9.45 minutes. How much of a 10-mg sample will be left in 6 minutes?
The half-life of a radioactive material is about 34.2 years. How much of the material is left after 20 years?
6
4. A well-circulated pond contains 1 million L of water that contains a pollutant at a concentration of 0.01 kg/L. Pure water enters from a stream at 100 L/h. Water evaporates from the pond (leaving the pollutant behind) at 50 L/h. How many days will it take for the concentration of pollutant to drop to 0.001 kg/L?
6. A food company stores grain in a hopper. The hopper is 12 feet in diameter and holds 2024.5 cubic feet of grain. When turned on, the hopper empties grain at a constant rate of 42 cubic feet per second. About how long does it take for the hopper to empty all the grain?
SHow all your work and don't type it, Post YOUR PICTURES! THank you
2. A tank is filled with 20 gallons of brine in which is dissolved 3 lbs of salt. Brine containing 3 lbs of salt per gallon enters at 2 gallons per minute. The well-stirred mixture leaves at 1 gallon per minute. a. How many salt are there in the tank after 13.50 minutes? b. How long will it take in minutes for the salt in the tank to increase from 18.10 lbs to 32.50 lbs? c. How long will it take in minutes in minutes for the salt in the tank to be 50.2 lbs?