Suppose a cup of tea initially at a temperature of 250°F is placed in a room which is held at a constant temperature of 100°F. If after one minute the tea has cooled to 155°F, compute, correct to the nearest whole number, the temperature of the tea after 2 minutes. A. 100 F B. 120°F C. 130 F D. 150 F O A

Suppose a cup of tea initially at a temperature of 250°F is placed in a room which is held at a constant temperature of 100°F. If after one minute the tea has cooled to 155°F, compute, correct to the nearest whole number, the temperature of the tea after 2 minutes. A. 100 F B. 120°F C. 130 F D. 150 F O A

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Concept explainers

Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.

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19
Suppose a cup of tea initially at a temperature of 250°F is placed in a room which is
held at a constant temperature of 100°F. If after one minute the tea has cooled to 155°F,
compute, correct to the nearest whole number, the temperature of the tea after 2 minutes.
A. 100 F
B. 120°F
C. 130 F
D. 150 F

46
Convert +2-8x=e" into a system of first order differential equations.
Vie
* = x,
Do
A.
= 8x, -2x, +e
* =x,
B.
*, = 8x, -2x, +e
X, = X,
C.
X, = 8x, +2x, + e
Custo
Ten
D.
*, = 2x, -8x, +e"
AN

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