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.
(7) (12 points) Let F(x, y, z) = (y, x+z cos yz, y cos yz).
Ꮖ
(a) (4 points) Show that V x F = 0.
(b) (4 points) Find a potential f for the vector field F.
(c) (4 points) Let S be a surface in R3 for which the Stokes' Theorem is valid. Use
Stokes' Theorem to calculate the line integral
Jos
F.ds;
as denotes the boundary of S. Explain your answer.
(3) (16 points) Consider
z = uv,
u = x+y,
v=x-y.
(a) (4 points) Express z in the form z = fog where g: R² R² and f: R² →
R.
(b) (4 points) Use the chain rule to calculate Vz = (2, 2). Show all intermediate
steps otherwise no credit.
(c) (4 points) Let S be the surface parametrized by
T(x, y) = (x, y, ƒ (g(x, y))
(x, y) = R².
Give a parametric description of the tangent plane to S at the point p = T(x, y).
(d) (4 points) Calculate the second Taylor polynomial Q(x, y) (i.e. the quadratic
approximation) of F = (fog) at a point (a, b). Verify that
Q(x,y) F(a+x,b+y).
=
(6) (8 points) Change the order of integration and evaluate
(z +4ry)drdy .
So S√ ²
0
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