Déjà Vu At 8:00 a.m. on Saturday, a nun begins running up the side of a mountain to his weekend campsite (see figure). On Sunday morning at 8:00 a.m., he runs back down the mountain. It takes him 20 minutes to run up but only10 minutes to run down. At some point on the way down, he realizes that he passed the same place at exactly the same time on Saturday. Prove that he is correct. [ Hint : Let s ( t ) and r ( t ) be the position functions for the runs up and down, and apply the Intermediate Value Theorem to the function f ( t ) = s ( t ) − r ( t ) .]
Déjà Vu At 8:00 a.m. on Saturday, a nun begins running up the side of a mountain to his weekend campsite (see figure). On Sunday morning at 8:00 a.m., he runs back down the mountain. It takes him 20 minutes to run up but only10 minutes to run down. At some point on the way down, he realizes that he passed the same place at exactly the same time on Saturday. Prove that he is correct. [ Hint : Let s ( t ) and r ( t ) be the position functions for the runs up and down, and apply the Intermediate Value Theorem to the function f ( t ) = s ( t ) − r ( t ) .]
Déjà Vu At 8:00
a.m.
on Saturday, a nun begins running up the side of a mountain to his weekend campsite (see figure). On Sunday morning at 8:00
a.m.,
he runs back down the mountain. It takes him 20 minutes to run up but only10 minutes to run down. At some point on the way down, he realizes that he passed the same place at exactly the same time on Saturday. Prove that he is correct. [Hint: Let s(t) and r(t) be the position functions for the runs up and down, and apply the Intermediate Value Theorem to the function
f
(
t
)
=
s
(
t
)
−
r
(
t
)
.]
3.1 Limits
1. If lim f(x)=-6 and lim f(x)=5, then lim f(x). Explain your choice.
x+3°
x+3*
x+3
(a) Is 5
(c) Does not exist
(b) is 6
(d) is infinite
1 pts
Let F and G be vector fields such that ▼ × F(0, 0, 0) = (0.76, -9.78, 3.29), G(0, 0, 0) = (−3.99, 6.15, 2.94), and
G is irrotational. Then sin(5V (F × G)) at (0, 0, 0) is
Question 1
-0.246
0.072
-0.934
0.478
-0.914
-0.855
0.710
0.262
.
2. Answer the following questions.
(A) [50%] Given the vector field F(x, y, z) = (x²y, e", yz²), verify the differential identity
Vx (VF) V(V •F) - V²F
(B) [50%] Remark. You are confined to use the differential identities.
Let u and v be scalar fields, and F be a vector field given by
F = (Vu) x (Vv)
(i) Show that F is solenoidal (or incompressible).
(ii) Show that
G =
(uvv – vVu)
is a vector potential for F.
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