A helicopter is on a path directly overhead line A B when it is simultaneously observed from locations A and B separated by 900 ft . The angle of elevation from A is 42 ° 30 ' and the angle of elevation from B is 30 ° 12 ' . a. What is the distance from each location to the helicopter? Round to the nearest foot. b. How high is the helicopter from the ground at the moment of observation? Round to the nearest foot.
A helicopter is on a path directly overhead line A B when it is simultaneously observed from locations A and B separated by 900 ft . The angle of elevation from A is 42 ° 30 ' and the angle of elevation from B is 30 ° 12 ' . a. What is the distance from each location to the helicopter? Round to the nearest foot. b. How high is the helicopter from the ground at the moment of observation? Round to the nearest foot.
Solution Summary: The author calculates the distances from the locations A and B to the helicopter, using the unit conversion factor (1°60
A helicopter is on a path directly overhead line
A
B
when it is simultaneously observed from locations
A
and
B
separated by
900
ft
. The angle of elevation from
A
is
42
°
30
'
and the angle of elevation from
B
is
30
°
12
'
.
a. What is the distance from each location to the helicopter? Round to the nearest foot.
b. How high is the helicopter from the ground at the moment of observation? Round to the nearest foot.
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.
A Problem Solving Approach To Mathematics For Elementary School Teachers (13th Edition)
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