Forge welding is a process in which two pieces of steel are joined together by heating the pieces of steel and hammering them together. A welder takes a piece of steel from a forge at 1600 o F and places it on an anvil where the outdoor temperature is 50 o F . The temperature of the steel T in o F can be modeled by T = 50 + 1550 e − 0.05 t , where t is the time in minutes after the steel is removed from the forge. How long will it take for the steel to reach a temperature of 100 o F so that it can be handled without heat protection? Round to the nearest minute.
Forge welding is a process in which two pieces of steel are joined together by heating the pieces of steel and hammering them together. A welder takes a piece of steel from a forge at 1600 o F and places it on an anvil where the outdoor temperature is 50 o F . The temperature of the steel T in o F can be modeled by T = 50 + 1550 e − 0.05 t , where t is the time in minutes after the steel is removed from the forge. How long will it take for the steel to reach a temperature of 100 o F so that it can be handled without heat protection? Round to the nearest minute.
Forge welding is a process in which two pieces of steel are joined together by heating the pieces of steel and hammering them together. A welder takes a piece of steel from a forge at
1600
o
F
and places it on an anvil where the outdoor temperature is
50
o
F
. The temperature of the steel
T
in
o
F
can be modeled by
T
=
50
+
1550
e
−
0.05
t
,
where t is the time in minutes after the steel is removed from the forge. How long will it take for the steel to reach a temperature of
100
o
F
so that it can be handled without heat protection? Round to the nearest minute.
In each of Problems 1 through 4, draw a direction field for the given differential equation. Based on the direction field, determine the behavior of y as t → ∞. If this behavior depends on the initial value of y at t = 0, describe the dependency.1. y′ = 3 − 2y
B 2-
The figure gives four points and some
corresponding rays in the xy-plane. Which of
the following is true?
A
B
Angle COB is in standard
position with initial ray OB
and terminal ray OC.
Angle COB is in standard
position with initial ray OC
and terminal ray OB.
C
Angle DOB is in standard
position with initial ray OB
and terminal ray OD.
D
Angle DOB is in standard
position with initial ray OD
and terminal ray OB.
temperature in degrees Fahrenheit, n hours since midnight.
5. The temperature was recorded at several times during the day. Function T gives the
Here is a graph for this function.
To 29uis
a. Describe the overall trend of temperature throughout the day.
temperature (Fahrenheit)
40
50
50
60
60
70
5
10 15 20 25
time of day
b. Based on the graph, did the temperature change more quickly between 10:00
a.m. and noon, or between 8:00 p.m. and 10:00 p.m.? Explain how you know.
(From Unit 4, Lesson 7.)
6. Explain why this graph does not represent a function.
(From Unit 4, Lesson 8.)
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