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Week 16-17 Application of DE of Order One en 1ab10 16 30 10 noi Name: Section: 3. At 1:00 P.M., a thermometer reading 70 °F is taken where the air temperature is -10 °F (ten below zero). At 1:02 P.M., the thermometer is taken back indoors, where the air is at 70 °F. What is the temperature reading at 1:09 P.M.? A 4. Radium decomposes in air at the rate proportional to the amount present It is found out that in 25years, 1.1% of a certain amount decomposed. Determine approximately how long will it take: a. b. C. For one-half of the original amount to decompose? 20% of the amount to decompose What percent of the amount will decompose in 50 years? Week 16-17 Application of DE of Order One 90 Name: Section: Problem Set 16 Solve for the following: 1. A thermometer reading 18° F is brought into a room where the temperature is 70°F; 1 minute later the thermometer reading is 31°F. Determine the temperature reading as a function of time and find the temperature reading 5 minutes after the thermometer is first brought into the room. Ans: 58°F 2. At 9:00AM, a thermometer reading 70° F is taken outdoors, where the temperature is 15° F. At the 9:05 A.M., the thermometer reading is 45° F. At 9:10 A.M., the thermometer is taken back indoors, where the temperature us fixed at 70 °F. Find (a) the reading at 9:20 A.M. and (b) when the reading, to the nearest degree, will show the correct (70° F) indoor temperature.

Week 16-17 Application of DE of Order One en 1ab10 16 30 10 noi Name: Section: 3. At 1:00 P.M., a thermometer reading 70 °F is taken where the air temperature is -10 °F (ten below zero). At 1:02 P.M., the thermometer is taken back indoors, where the air is at 70 °F. What is the temperature reading at 1:09 P.M.? A 4. Radium decomposes in air at the rate proportional to the amount present It is found out that in 25years, 1.1% of a certain amount decomposed. Determine approximately how long will it take: a. b. C. For one-half of the original amount to decompose? 20% of the amount to decompose What percent of the amount will decompose in 50 years? Week 16-17 Application of DE of Order One 90 Name: Section: Problem Set 16 Solve for the following: 1. A thermometer reading 18° F is brought into a room where the temperature is 70°F; 1 minute later the thermometer reading is 31°F. Determine the temperature reading as a function of time and find the temperature reading 5 minutes after the thermometer is first brought into the room. Ans: 58°F 2. At 9:00AM, a thermometer reading 70° F is taken outdoors, where the temperature is 15° F. At the 9:05 A.M., the thermometer reading is 45° F. At 9:10 A.M., the thermometer is taken back indoors, where the temperature us fixed at 70 °F. Find (a) the reading at 9:20 A.M. and (b) when the reading, to the nearest degree, will show the correct (70° F) indoor temperature.

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)
Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)
5th Edition
ISBN:9781305084766
Author:Saeed Moaveni
Publisher:Saeed Moaveni
Chapter11: Temperature And Temperature- Related Variables In Engineering
Section: Chapter Questions
Problem 7P
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Week 16-17 Application of DE of Order One en 1ab10 16 30 10 noi Name: Section: 3. At 1:00 P.M., a thermometer reading 70 °F is taken where the air temperature is -10 °F (ten below zero). At 1:02 P.M., the thermometer is taken back indoors, where the air is at 70 °F. What is the temperature reading at 1:09 P.M.? A 4. Radium decomposes in air at the rate proportional to the amount present It is found out that in 25years, 1.1% of a certain amount decomposed. Determine approximately how long will it take: a. b. C. For one-half of the original amount to decompose? 20% of the amount to decompose What percent of the amount will decompose in 50 years?
Transcribed Image Text:Week 16-17 Application of DE of Order One en 1ab10 16 30 10 noi Name: Section: 3. At 1:00 P.M., a thermometer reading 70 °F is taken where the air temperature is -10 °F (ten below zero). At 1:02 P.M., the thermometer is taken back indoors, where the air is at 70 °F. What is the temperature reading at 1:09 P.M.? A 4. Radium decomposes in air at the rate proportional to the amount present It is found out that in 25years, 1.1% of a certain amount decomposed. Determine approximately how long will it take: a. b. C. For one-half of the original amount to decompose? 20% of the amount to decompose What percent of the amount will decompose in 50 years?
Week 16-17 Application of DE of Order One 90 Name: Section: Problem Set 16 Solve for the following: 1. A thermometer reading 18° F is brought into a room where the temperature is 70°F; 1 minute later the thermometer reading is 31°F. Determine the temperature reading as a function of time and find the temperature reading 5 minutes after the thermometer is first brought into the room. Ans: 58°F 2. At 9:00AM, a thermometer reading 70° F is taken outdoors, where the temperature is 15° F. At the 9:05 A.M., the thermometer reading is 45° F. At 9:10 A.M., the thermometer is taken back indoors, where the temperature us fixed at 70 °F. Find (a) the reading at 9:20 A.M. and (b) when the reading, to the nearest degree, will show the correct (70° F) indoor temperature.
Transcribed Image Text:Week 16-17 Application of DE of Order One 90 Name: Section: Problem Set 16 Solve for the following: 1. A thermometer reading 18° F is brought into a room where the temperature is 70°F; 1 minute later the thermometer reading is 31°F. Determine the temperature reading as a function of time and find the temperature reading 5 minutes after the thermometer is first brought into the room. Ans: 58°F 2. At 9:00AM, a thermometer reading 70° F is taken outdoors, where the temperature is 15° F. At the 9:05 A.M., the thermometer reading is 45° F. At 9:10 A.M., the thermometer is taken back indoors, where the temperature us fixed at 70 °F. Find (a) the reading at 9:20 A.M. and (b) when the reading, to the nearest degree, will show the correct (70° F) indoor temperature.
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